required

1. VERB 需要;有赖于
   If you require something or if something is required, you need it or it is necessary.
   1. If you require further information, you should consult the registrar...
      如果需要进一步了解信息，请咨询教务主任。
   2. This isn't the kind of crisis that requires us to drop everything else...
      这样的危机并不需要我们抛弃其他的一切。
   3. Some of the materials required for this technique may be difficult to obtain.
      这项技术需要的某些材料可能很难获取。
2. VERB 要求;命令;规定
   If a law or rule requires you to do something, you have to do it.
   1. The rules also require employers to provide safety training...
      这些规定还要求雇主提供安全培训。
   2. At least 35 manufacturers have flouted a law requiring prompt reporting of such malfunctions...
      至少有35名制造商触犯了要求此类故障出现后立即上报的法律。
   3. The law now requires that parents serve on the committees that plan and evaluate school programs...
      现在，法律要求家长在规划和评估学校项目的委员会中任职。
   4. Then he'll know exactly what's required of him.
      到那时他就会确切地知道对他的要求是什么了。
3. PHRASE 必读的
   If you say that something is required reading for a particular group of people, you mean that you think it is essential for them to read it because it will give them information which they should have.
   1. ...an important research study that should be required reading for every member of the cabinet.
      每一位内阁成员都应阅读的一份重要研究论文

1. Forster established the essentiality of minerals as accessory food factors required for maintaining life.
   福斯特证实了矿物质作为辅助食物因子在维持生命方面的重要性。
2. She suffered from anaemia and even required blood transfusions.
   她患有贫血症，甚至需要输血。
3. Commercial vehicles, coaches and lorries are required by law to be fitted with tachographs.
   法律规定商用车辆、长途汽车和卡车要安装转速计。
4. Councils were required to compile a register of all adults living in their areas
   各地政务委员会被要求编制一份该地区成年居民的名册。
5. The project required the total demolition of the old bridge
   该项目要求将老桥完全拆毁。
6. The machine automatically downloads the required information to his or her fax.
   机器能自动将需要的信息下载到传真机上。
7. They seem to move the goal posts every time I meet the conditions which are required.
   好像每当我达到规定条件时，他们就改变规则。
8. He had kindly offered to loan us all the plants required for the exhibit
   他善解人意地提出愿意把展览需要的植物通通借给我们。
9. This revolutionary expansion required energetic nation-building policies.
   这种跨越式的扩张需要有活力的国家建设政策。
10. Those who had decided to remain neutral in the struggle now found themselves required to take sides.
    那些先前决定在争斗中保持中立的人现在发现他们需要表明立场了。
11. Interest is paid monthly. Three months 'notice is required for withdrawals
    利息按月支付。提款须提前3个月通知银行。
12. Few ministers have the nous or the instinct required to understand the ramifications
    没有几个大臣具备理解这些后果所需要的理性或直觉。
13. The required technology is probably still two years off.
    所需技术可能还要两年才能开发出来。
14. The nuclear industry was required to prove that every operational and safety aspect had been fully researched.
    核工业被要求证明其在运营与安全各方面都进行过充分的研究。
15. It was exacting work and required all his patience.
    工作很艰巨，需要他有极大的耐心。
16. Water each plant as often as required.
    按要求经常给每一株植物浇水。
17. Relevant work experience is required for overseas postings.
    派驻海外要求有相关的工作经验。
18. A job analysis should also include what skills and personal qualities are required.
    工作岗位分析也应当包括必备技能与个人素质。
19. Then he'll know exactly what's required of him.
    到那时他就会确切地知道对他的要求是什么了。
20. We were only able to make a rough estimate of how much fuel would be required
    我们只能对所需燃料作一个粗略的估计。
21. If you want good relationships, you must have the confidence to be self-assertive when required.
    如果想要发展成功的关系，在需要的时候必须有自信拿出主见。
22. For a self-regulatory system to work, the consent of all those involved is required.
    一个自我管理的体制要运作起来，必须得到所有相关人员的一致认可。
23. Some solid evidence was what was required
    需要的是一些确凿的证据。
24. The cafe owner has put up the required 'no smoking' signs, but thinks his responsibility stops there
    咖啡馆老板已经按规定贴上了“禁止吸烟”的标志，但是他认为自己的责任就止于此。
25. Each capsule contains between 30 and 100 pellets of morphine sulphate according to the strength of dose required
    根据所需剂量的浓度不同，每颗胶囊里含有30至100个***硫酸盐颗粒。
26. At the required level of visual verisimilitude, computer animation is costly.
    要使电脑动画的视觉效果达到要求的逼真程度，花费会十分昂贵。
27. Taking a long view of the project, I began to think in terms of the rehearsal schedules required.
    为了对这个项目作长远打算，我开始根据要求的排练计划考虑问题。
28. If this was what his job required, then the job wasn't really worth having
    如果这是他的工作所需，那么这份工作真的不值得去做。
29. All the participants were required to sign in as they entered the hall to attend the meeting.
    出席会议的人在进入大厅前均须签到。
30. All passengers are required to show [ present] their tickets.
    所有乘客都必须出示车票。

adj

1. required by rule
   1. in most schools physical education is compulsory
   2. attendance is mandatory
   3. required reading

   Synonym:    compulsorymandatory

2. necessary for relief or supply
   1. provided them with all things needful

   Synonym:    neededneedfulrequisite