A recurring theme is that as circumstances change, different sorts of leaders are required; a leader who thrives in one environment may struggle in another, and vice versa.

一个反复出现的主题是，随着环境的变化，人们需要不同类型的领导者；在一种环境中应对裕如的领导者可能在另一种环境中艰难挣扎，反之亦然。

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The claimants allege that manufacturers failed to warn doctors that their drugs should be used only in limited circumstances.

索赔人声称生产商没有警告医生他们生产的药品只能在特定的条件下使用。

《柯林斯英汉双解大词典》

He also said that forced transfers of staff, which critics say demoralized workers, would be applied only in exceptional circumstances.

VOA: standard.2010.04.11

And he's going to have to rectify the circumstances that made his destruction of the earth necessary in the first place.

他不得不修正,他认为有必要毁灭人类的情形。

耶鲁公开课 - 旧约导论课程节选

And I think there's that constant tussle going on in us Circumstances can push someone one way while another certain encouragement pushes more towards acting ethically.

在我们的内心时常会有这样的斗争,特定的环境促使我们选择漠视,同时，一些鼓励促使我们依照道德行事。

普林斯顿公开课 - 人性课程节选

As one of nine Democrats who joined the Republicans in voting against this article of impeachment in the Nixon case, I did not believe that in the circumstances of that case it rose to the level of a high crime and misdemeanor, I did not believe it was conduct against which the Founding Fathers intended the Congress to invoke the impeachment remedy.

CNN: Sen. Sarbanes' closed-door impeachment statement

The detained US national is Korean-American Kenneth Bae, who was arrested in November in circumstances that are not clear.

BBC: Google head and former US governor in North Korea visit

Mr Richardson said the delegation had raised the case of detainee Korean-American Kenneth Bae, who was arrested in November in circumstances that are not clear.

BBC: Google's Eric Schmidt urges N Korea web openness