They do something from necessity, not from a sense of duty.

他们因需要而做某事，并非出于责任感。

youdao

I missed an inner freedom, and felt that their humor was only a slick way of making a virtue from necessity.

我感到缺乏的是一种内在的自由，感到它们的幽默仅仅是一种狡猾的，为了幽默而产生的幽默。

youdao

The president pleaded that strong rule from the centre was a necessity.

总统争辩说来自中央的强有力的统治是一种必然。

《柯林斯英汉双解大词典》

Change comes from necessity.

变化源于需求

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He separated from her because of dire necessity.

而他又在流亡中与妻子走散

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In other words, as the judge said, what's always moral isn't necessarily against the law and while I don't think that necessity justifies theft or murder or any illegal act, at some point your degree of necessity does, in fact, exonerate you from any guilt.

换言之，正如法官常说的，情有可原，未必不可法外容情,当然我不认为，一句情有可原,就能为盗窃，谋杀以及其他违法行为正名，但有时，情有可原的程度,确实可能法外容情，赦免你的罪行。

耶鲁公开课 - 公正课程节选

Over the centuries, the reasons for hunting has evolved from necessity to sport and then to status symbol.

BBC: Sheikh's Borders falcon centre approved

His motivation for innovation came partly from necessity and partly from curiosity.

UNESCO: Title

It seems, from necessity, to be with us again.

ECONOMIST: Liberalism