Water is a basic necessity of life.

水是一种基本生活必需品。

《柯林斯英汉双解大词典》

There is agreement on the necessity of reforms.

关于改革的必要性有一致意见。

《柯林斯英汉双解大词典》

We were discussing the necessity of employing more staff.

我们在讨论是否需要雇用更多员工。

《牛津词典》

"Our emphasis in Canada for some time now,particularly since we extended our mission, has been the necessity of seeing the Afghan government accept and be able to handle greater responsibility for the day-to-day security of that country,".

VOA: standard.2009.09.16

And if money-makers in that one and there is neither order nor necessity in this life but calling this life sweet, free, and blessed, he follows it throughout.

如果换成是商人,没有规律及必然性的生活,而只是,惬意，自由与喜悦，他还彻底跟随这样的人生画面。

耶鲁公开课 - 政治哲学导论课程节选

Hobbes, as we see, sometimes writes as a sort of scientist or proto-scientist for whom nature and one supposes the laws of nature operate with the same kind of necessity as the laws of physical attraction.

霍布斯有些时候,像科学家或者原科学家一样写作,对他来说，自然和自然法,与另一种必需法则,即物质吸引的法则共同作用。

耶鲁公开课 - 政治哲学导论课程节选

Obama said Thursday that reform is a matter of necessity -- and not politics.

CNN: Divided Democrats put Obama in health care bind

The company's also quick to point out that its product's bezels are just a built-in necessity -- they give you a place to stick those thumbs when you're reading.

ENGADGET: Barnes & Noble's Nook HD 7-inch Android tablet, hands-on (video)

Multitasking is far more important on the personal computer -- whose windowed UI and raw horsepower make it not just a luxury but a necessity -- and one way the personal computer trumps the phone.

ENGADGET: Entelligence: Mobile multitasking is mostly a myth