be in necessity

常见例句

For avoiding this kind bane, there will be regulations in necessity.
为避免此种危害，就有必要对其进行法律规制。
I hope we never reach the point where we find these things to no longer be a necessity in our lives.
我希望我们永远不会出现这样一种情况——发觉这些东西对于我们的生活不再是必需品。
asking365.com
Multitasking(1) may be a necessity in today's fast-paced world, but new research shows distractions(2) affect the way people learn, making the knowledge they gain harder to use later on.
一心多用可能在当今快节奏的世界里是必要的，但最新研究发现注意力的分散会影响人们学习的方式，使学到的知识很难在日后得到应用。

If they acted with a kind of mechanical necessity or even geometric necessity, they could not possibly be moral laws in that way.
如果这些法则有机械上,或者几何上的必须性的话，它们就不能被称作道德法则。
耶鲁公开课 - 政治哲学导论课程节选
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

Given Serbia's hostility to Kosovo's independence, heavy reliance on foreigners will be a necessity in any case.
ECONOMIST: Kosovo: Independence day The
The search for profit, they argue, may be a regrettable necessity in the modern world, a sad fact of life if there is to be any private enterprise.
ECONOMIST: Capitalism and ethics
These used to be out of cheap necessity, in buildings where landlords were too stingy to shell out for even ceilings.
FORBES: What San Francisco Real Estate Tells Us About This Technology Boom