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TOEFL BNC: 3374 COCA: 3951
necessitynounuk/nəˈses.ə.ti/ us/nəˈses.ə.t̬i/

C1 [ U ] the need for something必要，需要

You can come early if you want to, but there's no necessity for it.你如果愿意可以早点儿来，但不是非早来不可。
[ + to infinitive ] Is there any necessity to reply to her letter?有必要给她回信吗?
The report stresses the necessity of eating plenty of fresh fruit and vegetables.这份报告强调了大量食用新鲜水果及蔬菜的必要性。
With a personal fortune of sixty million dollars, she certainly doesn't work out of necessity (= because she needs to).她有6000万美元的身家，当然不是为了生计而工作。
We'll employ extra staff to help out as and when the necessity arises (= when we need to).需要的时候我们会另雇员工帮忙。

C1 [ C ] something that you need, especially in order to live必需的东西；（尤指）生活必需品

We brought only the bare necessities with us.我们只带了基本的必需品。
He regarded music as one of life's necessities.他把音乐视作生活中必不可少的东西之一。

More examples

Eating is a biological necessity!

I took the job out of necessity because we had no money left.

With a courage born of necessity, she seized the gun and ran at him.

I had a couple of months to spare between jobs so I thought I'd make a virtue of necessity by acquiring a few new skills.

Idiom(s)

necessity is the mother of invention
TOEFL BNC: 3374 COCA: 3951
necessity

noun¹

 1fact that sth must happen; sth that cannot be avoided必然的事；不可避免的事ADJECTIVE | VERB + NECESSITY | NECESSITY + VERB | PREPOSITION | PHRASES ADJECTIVE➤absolute, fundamental, sheer, vital絕對必要；必不可少；完全必要◇Sleep is an absolute necessity for life.睡眠是生命中絕對必要的。➤dire, urgent緊急的／急迫的需要▸➤immediate即刻需要▸➤real真正必要➤perceived感知到的需要▸➤strategic戰略需要▸➤logical, physical, practical邏輯的必然；物理的必然；實用的必需品◇The people in the rural areas use mud bricks only as an immediate, practical necessity.農村人只是把泥磚作為一種便捷實用的必需品。➤business, economic, financial, historical, medical, military, political, social商務必需；經濟必需；財政必需；歷史必然；醫學必需；軍事必需；政治必需；社會必然◇He argued that nuclear weapons were a political necessity.他認為核武器在政治上是必需的。VERB + NECESSITY➤become成為必需◇A website has become a business necessity.網站已成為商業上的必需品。➤recognize, see, understand認識到／看到／理解必要性◇She saw the necessity to make an immediate impression on him.她意識到必須立刻給他留下印象。➤feel感到有必要◇I've never felt the necessity to rely on such a strict rule.我從不覺得非得遵循如此嚴格的規定。➤accept (sth as), be convinced of認可（⋯的）必要性；確信必要◇They have accepted the necessity of greater state intervention.他們已經認同國家進一步介入的必要。➤avoid, obviate, remove使不必要；免除必要性▸➤spare sb不一定非要某人（參與）不可◇Mrs R has been spared the necessity of having to give evidence.R 夫人獲准不是非要作證不可。➤emphasize, highlight, stress強調必要性；突出必要性◇Observers stressed the necessity for the ceasefire to be observed.觀察員強調必須遵守停火協議。➤be born of, be born out of出自⋯的必需◇Culling of the animals was born out of the necessity for successful conservation.宰殺動物中的弱者是保護自然的必要措施。➤be driven by受必要性驅使◇Driven by financial necessity, she decided to give up her writing career.由於經濟需要，她決定結束寫作生涯。NECESSITY + VERB➤arise必要性出現◇These animals don't like water but will swim if the necessity arises.這些動物不喜水，但必要時會游泳。➤dictate (sth), require (sth)必要性規定⋯／要求⋯◇This rule is carried no farther than necessity requires.這項規定僅限於在必要時施行。➤force sth必要性迫使⋯◇Necessity forced an urgent solution.有必要立即解決問題。PREPOSITION➤of necessity勢必◇The visit will, of necessity, be brief.訪問時間勢必會很短暫。➤out of necessity出於必要◇He is changing jobs out of necessity, not because he particularly wants to.他不得已才換工作，並非是自己特別願意。➤through necessity由於必要◇Most of the women are forced, through economic necessity, to work in part-time low-paid jobs.大多數婦女出於經濟原因才不得不做一些報酬低廉的兼職工作。➤without the necessity of沒有⋯的必要◇Most disputes can be resolved without the necessity of going to court.大多數爭端無需提到法庭上去就能解決。➤necessity for有必要⋯◇There's no necessity for you to come.你沒有必要來。➤necessity to做⋯的必要◇the necessity to earn a living謀生的需要PHRASES➤any necessity, no necessity有任何／沒有必要◇The company sees no necessity for a more cautious approach to investment.公司認為沒有必要採取更加謹慎的投資方式。
necessity

noun²

 2sth you must have必需的事物ADJECTIVE | VERB + NECESSITY | PHRASES ADJECTIVE➤absolute絕對的需要▸➤vital關鍵的必需品▸➤real真正的需要▸➤urgent緊急的需要◇Policies which address these issues are an urgent necessity.迫切需要的是解決這些問題的政策。➤bare, basic最起碼的需要；基本需要◇They have nothing but the barest necessities.除了最基本的必需品之外，他們一無所有。➤daily日常必需品VERB + NECESSITY➤have有必需的東西▸➤lack缺乏必需的東西PHRASES➤a necessity of life生活所需◇Food is a necessity of life.食物是維持生命所必需的。
TOEFL BNC: 3374 COCA: 3951
necessity noun
⇨ certainty (Living in London was an unfortunate necessity.) ⇨ need (basic necessities)
TOEFL BNC: 3374 COCA: 3951
necessity
Important thing or detail: feature, priority, element...
Something that is difficult or unpleasant to do or deal with: task, burden, necessity...

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