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Therefore, being careful is necessary.

因此，小心是必要的。

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But a recent study warned that more children than necessary are being exposed to radiation this way.

VOA: special.2009.10.28

We are political animals, he says, because participation in the life of the city is necessary for the achievement of human excellence, for the achievement of our well-being.

他说，我们是政治动物，因为参与城市生活,才能达致,人类卓越，也才能达致我们的福祉。

耶鲁公开课 - 政治哲学导论课程节选

Now, I think in certain circumstances it becomes necessary to overlook that unjustness, perhaps condone that injustice as in the case of the cabin boy being killed for food.

我认为在某些情况下,我们需要忽视这种不公平，容忍这种不正义,例如在救生艇里被当作食物的男孩。

耶鲁公开课 - 公正课程节选

There were many examples of institutional infelicities and underdone oversight exposed, and necessary reforms being prompted by excellent, sustained reporting.

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But even that vast sum of taxpayer lucre cannot will the necessary innovations into being.

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And having a large apps ecosystem is regarded as one of the necessary declarations of being a real player in the OS marketplace.

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