I did a study several years ago, asking procrastinators to finish a task in a certain period of time.

几年前我做过一项研究，要求拖延者在特定时间完成一项任务。

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They believe that there's a decent chance that they will die within a certain period of time.

他们相信自己在一段特定的时间后，有可能死亡。

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You can't get your money out for a certain period of time, but while it is there, it earns you interest.

在一定时间内你不能取款，但是银行会支付你利息。

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They believe that there's a decent chance that they will die within a certain period of time.

他们相信自己在一段特定的时间后,有可能死亡。

耶鲁公开课 - 死亡课程节选

But wouldn't it be nice to just have a certain period of time every day when you didn't have to even have it be ? so much as a remote possibility?

但要是每天能有一段特定的时间,死亡对你来说,甚至连一个遥远的可能性都不是,那岂不是很好？

耶鲁公开课 - 死亡课程节选

It began to infiltrate other disciplines and was in general a high-spirited horse for that certain period of time.

它逐渐渗入到其它学科,总之是那个时代的一匹黑马。

耶鲁公开课 - 文学理论导论课程节选

The only requirement is that consumers can get their hands on the game for free for at least a certain period of time.

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All options do are give the recipient the right to buy stock at a certain price per share within a certain period of time.

FORBES: Fact and Comment

Well it suggests, I think, that it is possible to combine economic dynamism with demographic stagnation, at least for a certain period of time.

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