This hypothesis makes intuitive sense, but certain aspects are troubling.

这种假设从直觉上讲是有道理的，但某些方面令人不安。

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Declining mental function is often seen as a problem of old age, but certain aspects of brain function actually begin their decline in young adulthood, a new study suggests.

心智功能衰退通常被视为老年问题，但一项新的研究表明，大脑功能的某些方面实际上在青年时代就开始衰退了。

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All participants could see the colour chosen by some of the other people, but certain participants had an extra advantage: the ability to see more of the participants' chosen colours than others.

所有的参与者都能看到其他人选择的颜色，但某些特定的参与者有一个额外的优势：他们比其他人看到更多参与者选择的颜色。

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"We will not only defend ourselves to the uttermost but will make it very certain that this form of treachery shall never again endanger us ...

VOA: special.2011.06.02

Suppose that most times and most activities were death free, but certain activities introduce the possibility of dying.

假设大部分时间和大部分活动都是死亡免疫的，但某些活动,会引起死亡的可能性。

耶鲁公开课 - 死亡课程节选

but you've got to be certain when you get out there. And make a positive move.

但是你在外面，你必须要小心。然后积极行动。

我使用自行车 - SpeakingMax英语口语达人

Robert Byrd, a seven-term Democrat, is all but certain to defeat Republican David Gallaher.

CNN: Both parties vie for control of the Senate

But certain ideas may have trickled down and may still be alive elsewhere in the network.

CNN: March 20, 2013 -- Updated 1211 GMT (2011 HKT)

That seems all but certain, given the speed with which the industry is deteriorating.

ECONOMIST: America's bank bail-out