know

verb

知悉 have information

1. 知道；知悉；了解
   to have information in your mind as a result of experience or because you have learned or been told it
   1. Do you know his address?
      你知道他的地址吗？
   2. The cause of the fire is not yet known.
      火灾的原因尚不清楚。
   3. All I know is that she used to work in a bank (= I have no other information about her) .
      我只知道她曾在银行工作过。
   4. I know (that) people's handwriting changes as they get older.
      我知道人们的笔迹随着年龄的增长而变化。
   5. It is widely known that CFCs can damage the ozone layer.
      众所周知氯氟烃会破坏臭氧层。
   6. I knew where he was hiding.
      我知道他藏在哪里。
   7. I didn't know what he was talking about.
      我不知道他在谈什么。
   8. ‘You've got a flat tyre.’ ‘I know.’
      “你的车胎瘪了。”“我知道。”
   9. ‘What's the answer?’ ‘I don't know.’
      “答案是什么？”“我不知道。”
   10. ‘There's no one in.’ ‘ How do you know? ’
       “里边一个人都没有。”“你怎么知道呢？”
   11. You know about Amanda's baby, don't you?
       你知道阿曼达的小宝宝吧？
   12. I don't know about you, but I'm ready for something to eat.
       不管你怎么样，反正我要吃点东西。
   13. I know of at least two people who did the same thing.
       我知道至少有两人干过同样的事。
   14. ‘Is anyone else coming?’ ‘ Not that I know of. ’
       “还有别的人要来吗？”“据我所知没有了。”
   15. ‘Isn't that his car?’ ‘ I wouldn't know./How should I know? (= I don't know and I am not the person you should ask.) ’
       “那不是他的汽车吗？”“我怎么会知道呢？”
   16. ‘What are you two whispering about?’ ‘ You don't want to know (= because you would be shocked or wouldn't approve) .’
       “你们俩在说什么悄悄话？”“你还是不知道的好。”
   17. Does he know to come here (= that he should come here) first?
       他知道要先到这儿来吗？
   18. We know her to be honest.
       我们知道她很诚实。
   19. Two women are known to have died.
       据悉两名妇女死了。

意识到 realize

2. 认识到；懂得；意识到
   to realize, understand or be aware of sth
   1. As soon as I walked in the room I knew (that) something was wrong.
      我刚走进屋就意识到出了事。
   2. She knew she was dying.
      她知道自己快死了。
   3. I knew perfectly well what she meant.
      我完全懂她的意思。
   4. I know exactly how you feel.
      我非常清楚你的感受。
   5. This case is hopeless and he knows it (= although he will not admit it) .
      这个案子毫无希望，这一点他是清楚的。
   6. ‘Martin was lying all the time.’ ‘ I should have known .’
      “马丁一直在撒谎。”“我本该察觉到的。”

确信 feel certain

3. 确信；确知；肯定
   to feel certain about sth
   1. He knew (that) he could trust her.
      他确信她是可以信赖的。
   2. I know it's here somewhere!
      我肯定它在这儿某个地方！
   3. I don't know that I can finish it by next week.
      我没有把握能在下周完成。
   4. ‘You were right─someone's been spreading rumours about you.’ ‘I knew it!’
      “你说得对——有人一直在散布你的谣言。”“我早就知道！”
   5. ‘She's the worst player in the team.’ ‘Oh, I don't know (= I am not sure that I agree) ─she played well yesterday.’
      “她是最糟的队员。”“哦，是吗？——她昨天表现可不错。”

熟悉 be familiar

4. 熟悉；认识；了解
   to be familiar with a person, place, thing, etc.
   1. I've known David for 20 years.
      我认识戴维已有20年了。
   2. Do you two know each other (= have you met before) ?
      你们俩认识吗？
   3. She's very nice when you get to know her.
      你了解她以后就会觉得她非常可爱。
   4. Knowing Ben , we could be waiting a long time (= it is typical of him to be late) .
      本这个人我们了解，能叫我们等很长时间。
   5. This man is known to the police (= as a criminal) .
      这男人是在警方挂了号的。
   6. I know Paris well.
      我很熟悉巴黎。
   7. Do you know the play (= have you seen or read it before) ?
      你知道这出戏吗？
   8. The new rules could mean the end of football as we know it (= in the form that we are familiar with) .
      这些新规则可能意味着我们熟悉的足球终结了。

名声 reputation

5. 把…看作是；认为…是
   to think that sb/sth is a particular type of person or thing or has particular characteristics
   1. It's known as the most dangerous part of the city.
      人们都认为那是市内最危险的地段。
   2. She is best known for her work on the human brain.
      她在对人脑的研究方面最为知名。
   3. He's known to be an outstanding physicist.
      他被公认为杰出的物理学家。

命名 give name

6. 将…称为；把…叫做
   to give sb/sth a particular name or title
   1. The drug is commonly known as Ecstasy.
      这种药通常称作***。
   2. Peter Wilson, also known as ‘the Tiger’.
      彼得∙威尔逊，也称“老虎”。

认出 recognize

7. 能认出；能辨认出
   to be able to recognize sb/sth
   1. I couldn't see who was speaking, but I knew the voice.
      我看不到谁在讲话，但我能辨认出声音。
   2. She knows a bargain when she sees one.
      她一看就知道有没有便宜可捡。

区分 distinguish

8. 能区分；能分辨
   to be able to distinguish one person or thing from another
   1. I hope we have taught our children to know right from wrong.
      我希望我们教给了孩子分辨是非的能力。

技能；语言 skill/language

9. 学会；掌握
   to have learned a skill or language and be able to use it
   1. Do you know any Japanese?
      你会日语吗？
   2. Do you know how to use spreadsheets?
      你知道电子数据表的使用方法吗？

经历 experience

10. 看到过；听到过；经历过
    to have seen, heard or experienced sth
    1. I've never known it (to) snow in July before.
       我以前从未见到过七月份下雪。
    2. He has been known to spend all morning in the bathroom.
       听说他整个上午都待在盥洗室里。
11. 亲身体验；亲身经历
    to have personal experience of sth
    1. He has known both poverty and wealth.
       他贫富生活都亲身经历过。
    2. She may be successful now, but she has known what it is like to be poor.
       她现在可能成功了，但她尝过贫穷的滋味。

noun

noun

1. VERB 知道；知悉；了解
   If you know a fact, a piece of information, or an answer, you have it correctly in your mind.
   1. I don't know the name of the place...
      我不知道那个地方的名字。
   2. I know that you led a rifle platoon during the Second World War...
      我知道你在二战期间率领一个步枪排。
   3. 'People like doing things for nothing.' — 'I know they do.'...
      “人们喜欢没事找事。”——“我知道确实是那样。”
   4. I don't know what happened to her husband...
      我不知道她丈夫出了什么事。
   5. 'How did he meet your mother?' — 'I don't know.'...
      “他怎么认识你母亲的？”——“我不知道。”
   6. We all know about his early experiments in flying...
      我们都了解他早期的飞行试验。
   7. They looked younger than I knew them to be...
      他们看起来比我所知道的实际年龄显小。
   8. Radon is known to be harmful to humans in large quantities...
      众所周知，大量的氡会对人体造成伤害。
   9. It is not known whether the bomb was originally intended for the capital itself...
      尚不清楚***起初的轰炸目标是否是首都。
   10. It's always been known that key figures in the government do very well for themselves.
       众所周知政府中的要员都很会保全自己的利益。
2. VERB 熟识；认识
   If you know someone, you are familiar with them because you have met them and talked to them before.
   1. Gifford was a friend. I'd known him for nine years...
      吉福德是我的一位朋友。我和他认识9年了。
   2. Do you two know each other?...
      你们俩互相认识吗？
   3. He doesn't know anybody in London.
      他在伦敦谁也不认识。
3. VERB 听说过；略有耳闻
   If you say that you know of something, you mean that you have heard about it but you do not necessarily have a lot of information about it.
   1. We know of the incident but have no further details...
      我们听说过这件事，但对详情不是很清楚。
   2. The president admitted that he did not know of any rebels having surrendered so far...
      总统承认据他所知迄今为止还没有反叛者投降。
   3. I know of no one who would want to murder Albert.
      我没听说有人想杀艾伯特。
4. VERB 了解，掌握（某一学科）
   If you know about a subject, you have studied it or taken an interest in it, and understand part or all of it.
   1. Hire someone with experience, someone who knows about real estate...
      雇佣有经验、了解房地产业的人。
   2. She didn't know anything about music but she liked to sing.
      虽然她对音乐一无所知，但却爱唱歌。
5. VERB 学会，掌握（语言）
   If you know a language, you have learned it and can understand it.
   1. It helps to know French and Creole if you want to understand some of the lyrics...
      如果你想读懂一些抒情诗，学点法语和克里奥尔语是有帮助的。
   2. Rachel already knows as many words in German as she does in English...
      雷切尔掌握的德语词汇已经和她掌握的英语词汇一样多了。
   3. Her new classmates knew no Latin.
      她的新同学不会拉丁语。
6. VERB 熟悉；了解
   If you know something such as a place, a work of art, or an idea, you have visited it, seen it, read it, or heard about it, and so you are familiar with it.
   1. No matter how well you know Paris, it is easy to get lost...
      不管你对巴黎多么熟悉，也很容易迷路。
   2. I don't know the play, I've just come to see it.
      我不了解这部剧，只是来看看。
7. VERB 会；能
   If you know how to do something, you have the necessary skills and knowledge to do it.
   1. The health authorities now know how to deal with the disease...
      卫生部门现在知道如何对付这种病了。
   2. We know what to do to make it work.
      我们知道如何让它起作用。
8. VERB 意识到；觉察到
   You can say that someone knows that something is happening when they become aware of it.
   1. Then I saw a gun under the hall table so I knew that something was wrong...
      后来我看到大厅的桌子下有一把枪，我就意识到有些不对劲儿。
   2. The first I knew about it was when I woke up in the ambulance.
      当我从救护车中苏醒过来时才知道发生了什么事。
9. VERB 认出；辨认出
   If you know something or someone, you recognize them when you see them or hear them.
   1. Would she know you if she saw you on the street?...
      如果她在大街上看到你，能认出你吗？
   2. I thought I knew the voice.
      我觉得在哪里听过这声音。
10. VERB 称为；叫做
    If someone or something is known as a particular name, they are called by that name.
    1. The disease is more commonly known as Mad Cow Disease...
       这种疾病更通俗的名称是疯牛病。
    2. He was born as John Birks Gillespie, but everyone knew him as Dizzy...
       他本名为约翰·伯克斯·吉莱斯皮，但人人都叫他“小迷糊”。
    3. He was the only boy in the school who was known by his Christian name and not his surname.
       他是学校里唯一一个被称呼洗礼名而不是姓氏的男孩儿。
    4. ...British Nuclear Fuels, otherwise known as BNFL.
       英国核料烧股份有限公司，也称BNFL。
11. VERB 认为…是；把…看作是
    If you know someone or something as a person or thing that has particular qualities, you consider that they have those qualities.
    1. Lots of people know her as a very kind woman...
       很多人认为她是个非常善良的女人。
    2. We know them as inaccurate and misleading property descriptions...
       我们认为对性状的这些描述是不准确的，且会使人产生误解。
    3. Kemp knew him for a meticulous officer.
       肯普认为他是个很细心的官员。
12. VERB （因某工作或角色）认识
    If you know someone as a person with a particular job or role, you are familiar with them in that job or role, rather than in any other.
    1. Most of us know her as the woman who used to present the television news...
       我们大多数人认识她是因为她曾主持过电视新闻节目。
    2. The soldiers — all of whom we knew as neighbours — stood around pointing guns at us.
       那些士兵——我们都视之为邻居的人——站在四周用枪指着我们。
13. See also: knowing known
14. PHRASE 现行的；我们熟悉的；我们熟知的
    If you talk about a thing or system as we know it, you are referring to the form in which it exists now and which is familiar to most people.
    1. He planned to end the welfare system as we know it.
       他计划终止现行的福利制度。
    2. ...those values of our culture that are essential to civilisation as we know it.
       我们文化中那些构成我们所熟悉的文明社会之根基的价值观
15. PHRASE （花时间）了解
    If you get to know someone, you find out what they are like by spending time with them.
    1. The new neighbours were getting to know each other...
       新邻居之间正在互相了解。
    2. I'd really like to see you again and get to know you better.
       我很愿意再次见到你并且更多地了解你。
16. PHRASE 谁知道；天晓得
    People use expressions such as goodness knows ,Heaven knows, and God knows when they do not know something and want to suggest that nobody could possibly know it.
    1. 'Who's he?' — 'God knows.'
       “他是谁？”——“天晓得。”
    2. Old Gunga spoke God knows how many languages...
       老贡嘎会说很多种语言，天晓得有多少种。
    3. Heaven only knows what his mother would have said.
       天晓得他母亲原本会说什么。
17. CONVENTION （表示同意）我理解，我有同感，我知道
    You say 'I know' to show that you agree with what has just been said.
    1. 'This country is so awful.' — 'I know, I know.'
       “这个国家太糟糕了。”——“的确是，的确是。”
18. CONVENTION （表示接受）我知道
    You say 'I know' to show that you accept that something is true, but think that it is not very important or relevant.
    1. 'There are trains straight from Cambridge.' — 'I know, but it's no quicker.'
       “有直接从剑桥开出的列车。”——“我知道，但也不快。”
19. PHRASE （表示同情和理解）我理解，我知道
    You use 'I know' to express sympathy and understanding towards someone.
    1. I'm sorry, George. I know how you feel...
       我很遗憾，乔治。我理解你的感受。
    2. I know what you're going through.
       我知道你正在经受什么样的煎熬。
20. PHRASE 不知道，不认为（表示不完全同意或不认为是真的）
    You can use I don't know to indicate that you do not completely agree with something or do not really think that it is true.
    1. 'He should quite simply resign.' — 'I don't know about that.'
       “他就该辞职。”——“我不知道。”
    2. I don't know that it's made the decision any easier.
       我不认为这对作出决定有丝毫帮助。
21. PHRASE 我不知道你（们）怎么想（表示将表达自己想法并想知道他人的看法）
    You can say 'I don't know about you' to indicate that you are going to give your own opinion about something and you want to find out if someone else feels the same.
    1. I don't know about the rest of you, but I'm hungry...
       我不知道你们怎么样，但我是饿了。
    2. I don't know about you, but I've had just about enough of this.
       我不知道你怎么想，但我已经受够了。
22. PHRASE （表示批评某人的行为）真想不到，真不知道
    You use I don't know in expressions which indicate criticism of someone's behaviour. For example, if you say that you do not know how someone can do something, you mean that you cannot understand or accept them doing it.
    1. I don't know how he could do this to his own daughter...
       真想不到他竟对自己的女儿这样。
    2. I don't know how you can say that...
       真想不到你竟说那话。
    3. I don't know what those folk think they are playing at.
       真不知道那些家伙在搞什么鬼。
23. PHRASE 我要是知道就好了；我根本不知道
    People sometimes use expressions such as I'm blessed if I know or damned if I know to emphasize the fact that they do not know something.
    1. 'What was that all about?' — 'Damned if I know.'
       “那都是关于什么的？”——“我要知道就好了。”
    2. I'm damned if I know what plans he has in that direction.
       我压根不知道他在那方面有什么计划。
24. PHRASE 知情；（尤指）熟悉内幕，掌握内情
    If you are in the know about something, especially something that is not known about or understood by many people, you have information about it.
    1. It was gratifying to be in the know about important people...
       了解重要人物的一些内幕真令人高兴。
    2. He takes crucial decisions without consulting people in the know.
       他没有咨询相关知情人士就作了重要的决定。
25. CONVENTION （表示所说的话对方理解）你是知道的，你知道我的意思
    You can use expressions such as you know what I mean and if you know what I mean to suggest that the person listening to you understands what you are trying to say, and so you do not have to explain any more.
    1. None of us stayed long. I mean, the atmosphere wasn't — well, you know what I mean...
       我们都没呆太久。我的意思是，气氛并不是——唔，你知道我的意思。
    2. She was a bit stuck up, know what I mean?
       她有点自命不凡，你明白我的意思吧?
26. CONVENTION （指可能会发生好事）很难说，很难预料
    You say 'You never know' or 'One never knows' to indicate that it is not definite or certain what will happen in the future, and to suggest that there is some hope that things will turn out well.
    1. You never know, I might get lucky...
       很难说，我也许会交好运呢。
    2. There might be an even bigger one — I doubt it, but you never know.
       可能还有个比这还要大的——我觉得有点悬，但也很难说。
27. CONVENTION 据我所知没有
    You say 'Not that I know of' when someone has asked you whether or not something is true and you think the answer is 'no' but you cannot be sure because you do not know all the facts.
    1. 'Is he married?' — 'Not that I know of.'
       “他结婚了吗？”——“据我所知没有。”
28. PHRASE 我怎么知道；我不知道
    You can say 'How was I to know?', or in British English 'I wasn't to know', to mean that you cannot be blamed or criticized for something you did, because you did not have enough information to realize that it was wrong.
    1. How was I to know you'd return so suddenly?...
       我怎么知道你会这么突然就回来?
    2. You weren't to know — in fact, I think I'm the only person who does know.
       你不会知道——实际上，我想我是唯一真正知道的人。
29. PHRASE （某人）知道什么，懂什么（表示其没有资格评论）
    You can use expressions such as What does she know? and What do they know? when you think that someone has no right to comment on a situation because they do not understand it.
    1. Don't listen to him, what does he know?...
       别听他的，他知道什么？
    2. I always felt his attitude was, 'What do you know about it?'
       我感觉他总是那种“你懂什么？”的态度。
30. EXCLAM （表示惊讶）你看怪不怪，真没想到
    People sometimes say 'What do you know!' when they are very surprised about something.
    1. Well, what do you know!
       哎呀，真没想到！
31. CONVENTION （加强语气或引起注意）你要知道
    You use you know to emphasize or to draw attention to what you are saying.
    1. The conditions in there are awful, you know...
       你要知道，那里的条件很艰苦。
    2. You know, it does worry me.
       你要知道，这实在让我担心。
32. CONVENTION （表示不确定要说的话或考虑接着说什么）你知道
    People use you know when they are uncertain about what they are saying or what they are going to say next.
    1. He's generous and, you know, very nice, very polite...
       他很大方而且，你知道，很友善，很有礼貌。
    2. I thought I'd, you know, have a chat with you.
       我想我应该，呃，和你谈谈。
33. CONVENTION （表示进一步解释）你是知道的，你难道不知道
    You use you know when you are trying to explain more clearly what you mean, by referring to something that the person you are talking to knows about.
    1. Wear the white dress, you know, the one with all the black embroidery.
       穿那件白裙，你知道的，上面有黑色刺绣的那件。
34. PHRASE （加强语气）你不知道，你都想不到
    You can say 'You don't know' in order to emphasize how strongly you feel about the remark you are going to make.
    1. You don't know how good it is to speak to somebody from home.
       你不知道和家乡来的人说说话感觉有多好。
35. to know something backwards → see: backwards

1. I don't know the name of the place
   我不知道那个地方的名字。
2. Gifford was a friend. I'd known him for nine years
   吉福德是我的一位朋友。我和他认识9年了。
3. We know of the incident but have no further details
   我们听说过这件事，但对详情不是很清楚。
4. Hire someone with experience, someone who knows about real estate
   雇佣有经验、了解房地产业的人。
5. It helps to know French and Creole if you want to understand some of the lyrics
   如果你想读懂一些抒情诗，学点法语和克里奥尔语是有帮助的。
6. No matter how well you know Paris, it is easy to get lost
   不管你对巴黎多么熟悉，也很容易迷路。
7. The health authorities now know how to deal with the disease
   卫生部门现在知道如何对付这种病了。
8. Then I saw a gun under the hall table so I knew that something was wrong
   后来我看到大厅的桌子下有一把枪，我就意识到有些不对劲儿。
9. Would she know you if she saw you on the street?
   如果她在大街上看到你，能认出你吗？
10. The disease is more commonly known as Mad Cow Disease
    这种疾病更通俗的名称是疯牛病。
11. Lots of people know her as a very kind woman
    很多人认为她是个非常善良的女人。
12. Most of us know her as the woman who used to present the television news
    我们大多数人认识她是因为她曾主持过电视新闻节目。
13. He planned to end the welfare system as we know it.
    他计划终止现行的福利制度。
14. The new neighbours were getting to know each other
    新邻居之间正在互相了解。
15. 'Who's he?' — 'God knows.'
    “他是谁？”——“天晓得。”
16. 'This country is so awful.' — 'I know, I know.'
    “这个国家太糟糕了。”——“的确是，的确是。”
17. 'There are trains straight from Cambridge.' — 'I know, but it's no quicker.'
    “有直接从剑桥开出的列车。”——“我知道，但也不快。”
18. I'm sorry, George. I know how you feel
    我很遗憾，乔治。我理解你的感受。
19. 'He should quite simply resign.' — 'I don't know about that.'
    “他就该辞职。”——“我不知道。”
20. I don't know about the rest of you, but I'm hungry
    我不知道你们怎么样，但我是饿了。
21. I don't know how he could do this to his own daughter
    真想不到他竟对自己的女儿这样。
22. 'What was that all about?' — 'Damned if I know.'
    “那都是关于什么的？”——“我要知道就好了。”
23. It was gratifying to be in the know about important people
    了解重要人物的一些内幕真令人高兴。
24. None of us stayed long. I mean, the atmosphere wasn't — well, you know what I mean
    我们都没呆太久。我的意思是，气氛并不是——唔，你知道我的意思。
25. You never know, I might get lucky
    很难说，我也许会交好运呢。
26. 'Is he married?' — 'Not that I know of.'
    “他结婚了吗？”——“据我所知没有。”
27. How was I to know you'd return so suddenly?
    我怎么知道你会这么突然就回来？
28. Don't listen to him, what does he know?
    别听他的，他知道什么？
29. Well, what do you know!
    哎呀，真没想到！
30. The conditions in there are awful, you know
    你要知道，那里的条件很艰苦。

  know recognize【导航词义：认出】

  know v. 认出

〔辨析〕指辨认出某人或某物，强调辨认、区分的能力。

  recognize v. 认出，辨认出

〔辨析〕指认出原先见过、听过、经历过的人或事物。

v.

before you know where you are

• 瞬息之间；转眼间；一下子
  very quickly or suddenly
  1. We were whisked off in a taxi before we knew where we were.
     还没等我们弄清怎么回事，出租车就一阵风似地把我们带走了。

be not to know

• 无从知道，并不知道（做错了事）
  to have no way of realizing or being aware that you have done sth wrong
  1. ‘I'm sorry, I called when you were in bed.’ ‘Don't worry─you weren't to know.’
     “对不起，你睡觉时打电话打扰你了。”“别在意——你不是故意的嘛。”

for all you, I, they, etc. know

• （强调不知道对自己无关紧要的事）不知道，说不定，亦未可知
  used to emphasize that you do not know sth and that it is not important to you
  1. She could be dead for all I know.
     她说不定已经死了。

God/goodness/Heaven knows

• （强调不知道）谁知道，天晓得
  used to emphasize that you do not know sth
  1. God knows what else they might find.
     谁知道他们还可能找到什么。
  2. ‘Where are they?’ ‘Goodness knows.’
     “他们在哪儿？”“天晓得。”
• （强调所言属实）老天作证，确实，的确
  used to emphasize the truth of what you are saying
  1. She ought to pass the exam─goodness knows she's been working hard enough.
     她应该考合格——她可真够努力了。

I don't know how, why, etc.…

• （批评某人的行为）真想不到，真不知道
  used to criticize sb's behaviour
  1. I don't know how you can say things like that.
     真想不到你怎么会说出这种话来。

I know

• （表示同意或同情）我理解，我有同感，我知道
  used to agree with sb or to show sympathy
  1. ‘What a ridiculous situation!’ ‘I know.’
     “这境况真荒唐！”“的确是。”
• （引出新的想法或建议）我有个主意（或办法、建议）
  used to introduce a new idea or suggestion
  1. I know, let's see what's on at the theatre.
     我有主意了，咱们看看剧院在上演什么。

know sth as well as I do

• （用以批评）其实完全明白，哪会不知道，知道得很清楚
  used to criticize sb by saying that they should realize or understand sth
  1. You know as well as I do that you're being unreasonable.
     其实你完全明白你是在故意胡搅蛮缠。

know sb/sth backwards

• 对…了如指掌（或倒背如流）；把…背得滚瓜烂熟
  to know sb/sth extremely well
  1. She must know the play backwards by now.
     她现在对这个剧本肯定是倒背如流。

know best

• 最懂得，最知道，比谁都明白（该怎么做，等等）
  to know what should be done, etc. better than other people
  1. The doctor told you to stay in bed, and she knows best.
     医生叫你卧床休息，她最清楚你该怎么做。

know better (than that/than to do sth)

• 明白事理（而不至于）；不至于糊涂到
  to be sensible enough not to do sth
  1. He knows better than to judge by appearances.
     他明白得很，绝不会凭表面现象来判断。

know sb by sight

• 与某人面熟
  to recognize sb without knowing them well

know different/otherwise

• 所知道的不是那么回事；所掌握的情况大不一样（或大相径庭）
  to have information or evidence that the opposite is true
  1. He says he doesn't care about what the critics write, but I know different.
     他说他并不在乎批评家的评论，可我知道不是那么回事。

know full well

• 非常清楚；不可否认；不可忽视
  to be very aware of a fact and unable to deny or ignore it
  1. He knew full well what she thought of it.
     他非常清楚她对此事的看法。

know sb/sth inside out

know sb/sth like the back of your hand

• 对…极为熟悉（或了如指掌）
  to be very familiar with sth
  1. This is where I grew up. I know this area like the back of my hand.
     我在这儿长大的，我对这地方再熟悉不过了。

know your own mind

• 知道自己想做什么；有主见
  to have very firm ideas about what you want to do

know your stuff

• 精通业务；对工作很内行
  to know a lot about a particular subject or job

know your way around

• 熟悉周围情况（或课题等）
  to be familiar with a place, subject, etc.

know what you're talking about

• 亲身经历过；作经验之谈
  to have knowledge about sth from your own experience

know which side your bread is buttered

• 知道自己的利益所在
  to know where you can get an advantage for yourself

let it be known/make it known that…

• （尤指通过他人传达而）使人知晓，让人知道
  to make sure that people are informed about sth, especially by getting sb else to tell them
  1. The President has let it be known that he does not intend to run for election again.
     总统已经公开表示他不打算再次参加竞选。

let sb know

• 让某人知道；告诉（或通知）某人
  to tell sb about sth
  1. Let me know how I can help.
     我能帮什么忙，只管说。

make yourself known to sb

• 向某人作自我介绍
  to introduce yourself to sb
  1. I made myself known to the hotel manager.
     我向旅馆老板作了自我介绍。

not know any better

• （因缺乏教养而）表现不好；因无人指教而举止不良
  to behave badly, usually because you have not been taught the correct way to behave

not know your arse from your elbow

• 愚蠢之至；屁都不懂
  to be very stupid or completely lacking in skill

not know beans about sth

• 完全不懂行；对…一窍不通
  to know nothing about a subject

not know the first thing about sb/sth

• 对…一无所知；对…一窍不通
  to know nothing at all about sb/sth

not know sb from Adam

• 根本不认识某人；与某人素不相识
  to not know at all who sb is

not know what hit you

• 因吃惊而不知所措；惊呆了
  to be so surprised by sth that you do not know how to react

not know where to look

• 尴尬得不知如何是好；狼狈不堪；感到很难堪
  to feel great embarrassment and not know how to react

not know whether you're coming or going

• （激动得）不知如何是好；糊里糊涂；不知所措
  to be so excited or confused that you cannot behave or think in a sensible way

not know you are born

• 身在福中不知福
  to have an easy life without realizing how easy it is
  1. You people without kids don't know you're born.
     你们没孩子，真是身在福中不知福啊。

there's no knowing

• 难以预料；无从知道；没法说
  used to say that it is impossible to say what might happen
  1. There's no knowing how he'll react.
     很难预料他会有什么样的反应。

what does… know?

• （某人）知道什么，懂什么
  used to say that sb knows nothing about the subject you are talking about
  1. What does he know about football, anyway?
     不管怎么说，他懂什么足球？

what do you know?

• （表示惊奇）你看怪不怪，真没想到
  used to express surprise
  1. Well, what do you know? Look who's here!
     唷，真想不到！你看谁来啦！

you know

• （说话人考虑接着说什么时用）
  used when you are thinking of what to say next
  1. Well, you know, it's difficult to explain.
     唉，你知道，这很难解释。
• （表示对方知道或了解所言）你知道的
  used to show that what you are referring to is known or understood by the person you are speaking to
  1. Guess who I've just seen? Maggie! You know─Jim's wife.
     你猜我刚才看见谁了，玛吉！你难道不知道——吉姆的妻子呀。
  2. You know that restaurant round the corner? It's closed down.
     拐角那家餐馆，你知道吧？已经倒闭了。
• （加强语气）你要知道
  used to emphasize sth that you are saying
  1. I'm not stupid, you know.
     你要知道，我不是傻子。

you know something/what?

• （引出令人感兴趣或吃惊的看法、消息等）要我告诉你吗，你听说了吗
  used to introduce an interesting or surprising opinion, piece of news, etc.
  1. You know something? I've never really enjoyed Christmas.
     要我告诉你吗？圣诞节我从未真正快乐过。

you know who/what

• （不说出名称）你知道是谁 / 什么
  used to refer to sb/sth without mentioning a name

you never know

• （尤指可能会发生好事）很难说，很难预料
  used to say that you can never be certain about what will happen in the future, especially when you are suggesting that sth good might happen

have/know all the answers

• （自以为）全懂，什么都精通
  to be confident that you know sth, especially when you actually do not
  1. He thinks he knows all the answers.
     他自以为什么都知道。

know/learn/find sth to your cost

• 付出过代价（或吃了苦头）才知道
  to know sth because of sth unpleasant that has happened to you
  1. He's a ruthless businessman, as I know to my cost.
     我吃了苦头后才知道他是个无情的商人。

have seen/known better days

• 穷困潦倒；昔盛今衰；曾辉煌过
  to be in poor condition
  1. Our car has seen better days!
     我们的汽车曾辉煌一时！

better the devil you know (than the devil you don't)

• 熟悉的魔鬼比不熟悉的魔鬼好；不要嫌熟悉的环境不好，换个不熟悉的环境可能更糟
  used to say that it is easier and wiser to stay in a bad situation that you know and can deal with rather than change to a new situation which may be much worse

as far as I know

as far as I can remember, see, tell, etc.

• 就我所知；尽我所记得的；依我看
  used to say that you think you know, remember, understand, etc. sth but you cannot be completely sure, especially because you do not know all the facts
  1. As far as we knew, there was no cause for concern.
     就我们所知，没有什么要担心的。
  2. As far as I can see, you've done nothing wrong.
     依我看，你没有做错任何事。
  3. She lived in Chicago, as far as I can remember.
     据我所记得的，她过去住在芝加哥。

Lord knows…

• （强调所说的话）众所周知，谁都知道
  used to emphasize what you are saying
  1. Lord knows, I tried to teach her.
     谁都知道，我曾经努力想教她。

old enough to know better

• 已长大，该懂事了
  old enough to behave in a more sensible way than you actually did

have/know sth off pat

• 了如指掌；滚瓜烂熟
  to know sth perfectly so that you can repeat it at any time without having to think about it
  1. He had all the answers off pat.
     所有的答案他都胸有成竹。

show sb/know/learn the ropes

• 向某人演示 / 知道 / 学会如何做某事
  to show sb/know/learn how a particular job should be done

know/tell sb a thing or two (about sb/sth)

• 了解 / 透露有用的（或有趣的、意外的）信息；有所了解 / 披露；见多识广
  to know/tell sb some useful, interesting or surprising information about sb/sth
  1. She's been married five times, so she knows a thing or two about men!
     她结过五次婚，所以对男人有所了解。

if (the) truth be known/told

• （用于说出真相）说实话，说真的，老实说
  used to tell sb the true facts about a situation, especially when these are not known by other people

n.

in the know

• 知情；熟悉内幕；掌握内情
  having more information about sth than most people
  1. Somebody in the know told me he's going to resign.
     有知情者告诉我他要辞职了。

noun

1. the fact of being aware of information that is known to few people
   1. he is always in the know

verb

1. accept (someone) to be what is claimed or accept his power and authority
   1. The Crown Prince was acknowledged as the true heir to the throne
   2. We do not recognize your gods

   Synonym:    acknowledgerecognizerecognise

2. be familiar or acquainted with a person or an object
   1. She doesn't know this composer
   2. Do you know my sister?
   3. We know this movie
   4. I know him under a different name
   5. This flower is known as a Peruvian Lily

3. be cognizant or aware of a fact or a specific piece of information
   1. I know that the President lied to the people
   2. I want to know who is winning the game!
   3. I know it's time

   Synonym:    cognizecognise

4. be aware of the truth of something
   1. I know that I left the key on the table
   2. Galileo knew that the earth moves around the sun

5. know how to do or perform something
   1. She knows how to knit
   2. Does your husband know how to cook?

6. have fixed in the mind
   1. I know Latin
   2. This student knows her irregular verbs
   3. Do you know the poem well enough to recite it?

7. have firsthand knowledge of states, situations, emotions, or sensations
   1. I know the feeling!
   2. have you ever known hunger?
   3. I have lived a kind of hell when I was a drug addict
   4. The holocaust survivors have lived a nightmare
   5. I lived through two divorces

   Synonym:    experiencelive

8. perceive as familiar
   1. I know this voice!

9. be able to distinguish, recognize as being different
   1. The child knows right from wrong

10. know the nature or character of
    1. we all knew her as a big show-off

11. have sexual intercourse with
    1. This student sleeps with everyone in her dorm
    2. Adam knew Eve
    3. Were you ever intimate with this man?

    Synonym:    sleep togetherroll in the haylovemake outmake lovesleep withget laidhave sexdo itbe intimatehave intercoursehave it awayhave it offscrewfuckjazzeffhumplie withbedhave a go at itbangget it onbonk