necessity
noun uk/nəˈses.ə.ti/ us/nəˈses.ə.t̬i/
C1 [ U ]必要，需要
the need for something
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 ]必需的东西；（尤指）生活必需品
something that you need, especially in order to live
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
necessity is the mother of inventionidiom saying 需要乃发明之母。
an expression that means that if you really need to do something, you will think of a way of doing it