It's definitely a necessity since there is not someone else there to help you with your kids.

VOA: standard.2009.12.04

When you're serious, any way to win will do, but mostly you could make a virtue of a necessity.

一旦你较真,你会为了胜利不择手段,但通常你会在之前进行道德的考虑

耶鲁公开课 - 古希腊历史简介课程节选

I mean, it's kind of a necessity for a lot of students, myself included, to have these jobs

我的意思是，对于大多数学生而言，
也包括我在内，做这些工作是很有必要的，

再没时间也要挤出来 - SpeakingMax英语口语达人

Henderson,who is now 63, says he started to make guitars as a young boy,out of necessity.

VOA: standard.2010.07.06

Poetry is a response to the daily necessity of getting the world right."

诗歌是对世界正确转动的琐事的反应“

耶鲁公开课 - 现代诗歌课程节选

Anything less than that is trying to fight a war of necessity on the cheap,".

VOA: standard.2009.11.16

Leda and the Swan" seems to say a knowledge of the body, of the necessity of embodiment. In the late Yeats, in the poems that I'll be discussing today, there's no knowledge apart from the body.

这诗里似乎说的是身体的知识，表现的必要性，我们要谈论的,叶芝的晚期诗讲的就是身体。

耶鲁公开课 - 现代诗歌课程节选

It is a necessity. He believes that the first priority of any climate bill enacted by Congress must be to put a cap on global warming gases.

VOA: standard.2010.06.14