necessity

noun

1. 必然；必要；需要
   the fact that sth must happen or be done; the need for sth
   1. We recognize the necessity for a written agreement.
      我们认为有必要签订一份书面协议。
   2. We were discussing the necessity of employing more staff.
      我们在讨论是否需要雇用更多员工。
   3. There had never been any necessity for her to go out to work.
      她从来就没有出去工作的必要。
   4. This is, of necessity , a brief and incomplete account.
      这必然是一份简略的、不完全的描述。
2. 必需的事物；必需品
   a thing that you must have and cannot manage without
   1. Many people cannot even afford basic necessities such as food and clothing.
      许多人甚至买不起食物和衣服之类的基本必需品。
   2. Air-conditioning is an absolute necessity in this climate.
      这样的气候绝对需要有空调。
3. 必然性；不可避免的情况
   a situation that must happen and that cannot be avoided
   1. Living in London, he felt, was an unfortunate necessity.
      他觉得在伦敦生活是迫于无奈。

1. N-UNCOUNT 必然;必要
   The necessity of something is the fact that it must happen or exist.
   1. There is agreement on the necessity of reforms...
      对改革的必要性已经达成了共识。
   2. As soon as the necessity for action is over the troops must be withdrawn...
      一旦军事行动的必要性不复存在，军队就必须撤出。
   3. Most women, like men, work from economic necessity...
      与男人一样，大部分女人也是出于经济原因而工作。
   4. Some people have to lead stressful lifestyles out of necessity.
      一些人迫于生计不得不过着紧张忙碌的生活。
2. N-COUNT 必需品;必不可少的事物
   A necessity is something that you must have in order to live properly or do something.
   1. Water is a basic necessity of life.
      生命离不开水。
   2. ...food, fuel and other daily necessities.
      食物、燃料和其他日常必需品
3. N-COUNT 不可避免的情况(或行动)
   A situation or action that is a necessity is necessary and cannot be avoided.
   1. The President pleaded that strong rule from the centre was a regrettable, but temporary necessity.
      总统辩解说，实行高度的中央集权虽不尽如人意，但暂时来说却是必要的。

1. It would be the first time in human history that economic necessity has prevailed over military aggrandizement.
   那应该是人类历史上首次经济需要高于军事扩张。
2. The population failed to understand the necessity for the war to go on.
   人们不能理解那场战争再继续下去有什么必要。
3. The violence of the revolutionary years was justifiable on the grounds of political necessity.
   出于政治需要，革命年代的暴力行为是情有可原的。
4. There is agreement on the necessity of reforms
   对改革的必要性已经达成了共识。
5. As soon as the necessity for action is over the troops must be withdrawn
   一旦军事行动的必要性不复存在，军队就必须撤出。
6. Most women, like men, work from economic necessity
   与男人一样，大部分女人也是出于经济原因而工作。
7. Some people have to lead stressful lifestyles out of necessity.
   一些人迫于生计不得不过着紧张忙碌的生活。
8. Water is a basic necessity of life.
   生命离不开水。
9. The President pleaded that strong rule from the centre was a regrettable, but temporary necessity.
   总统辩解说，实行高度的中央集权虽不尽如人意，但暂时来说却是必要的。
10. Mr Casey said he could see no necessity to add any rider on the use of firearms by police
    凯西先生说他觉得没有必要增加任何有关警察使用枪支的附加条款。
11. Roden had already constructed a rude cabin for himself and his family in case of necessity.
    罗登已为自己和家人搭好了一个简陋的小木屋，以备不时之需。
12. Necessity is the mother of invention.
    需要乃发明之母。
13. You must understand the necessity of education.
    你必须懂得教育的必要性。
14. Are the investment banks selling cheaply, out of necessity?
    投资银行是否完全不必要贱价出售？
15. Necessity is a hard dart.
    情急智生。
16. Once it had decided on a cease-fire out of military necessity, it was ready to extract the maximum aid from us.
    一旦它出于军事的需要决定停火时，它就准备从我们那里最大限度地榨取援助。
17. The article proves the necessity of reform.
    文章论证了改革的必要性。
18. Necessity and basis of construction of projects;
    项目建设的必要性和依据；
19. This paper points out the necessity and feasibility of a new software design method in developing new digital relays.
    指出了采用新的软件设计方法设计微机保护装置的必要性和可行性。
20. The second part analyses certainty and necessity of forming activity curriculum of moral education under background.
    第二部分，分析了新的时代背景下，构建德育活动课程的必然性和必要性；
21. This paper discusses the necessity of studying government statistical data quality.
    文章论述了对国家统计数据质量进行深入系统研究的必要性。
22. These objectives determine the accrual basis of the necessity and the specific application model.
    这些目标决定了采用权责发生制的必要性和具体应用模式。
23. Among them, the user demand analysis elaborated develops this system the reason, the significance and the necessity;
    其中，用户需求分析阐述了开发本系统的原因、意义及必要性；
24. Necessity for study of adaptive ability of missile is analyzed.
    分析了导弹自适应能力研究的必要性。
25. The necessity and importance of studying the modernization of Chinese medicine are discussed.
    论述了中医现代化研究的必要性和重要性。
26. This article discussed from the necessity of legislation of "Lottery Law" and its legal property.
    本文从《彩票法》立法的必要性及其法律属性方面进行了论述。
27. This article discusses its necessity, content and approaches.
    本文论述了其必要性、教育内容及方法途径。
28. The feasibility and necessity of Reverse Osmosis in drinking water preparation are discussed in this paper.
    论述了应用反渗透方法净化饮用水的必要性和可能性。
29. The unbalance of Chinese social development leads to the necessity and urgence of the reform of census register system.
    中国社会发展的失衡性导致了户口迁移制度改革的必要性和紧迫性。
30. The necessity and feasibility that the strategic auditing is used on financial statements auditing are analyzed in this dissertation.
    本文分析了战略审计用于财务报表审计的必要性和可行性。

n.

necessity is the mother of invention

• 需要是发明之母
  a difficult new problem forces people to think of a solution to it

make a virtue of necessity

• 不得已而力争有所得
  to manage to gain an advantage from sth that you have to do and cannot avoid

noun

1. anything indispensable
   1. food and shelter are necessities of life
   2. the essentials of the good life
   3. allow farmers to buy their requirements under favorable conditions
   4. a place where the requisites of water fuel and fodder can be obtained

   Synonym:    essentialrequirementrequisitenecessary

2. the condition of being essential or indispensable