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。

youdao

The arrival of a letter will be followed by two others within a certain period.

收到一封信后，在一定的时间内会收到另外两封信。

youdao

Old version might be put offline after a certain period.

旧版本可能在一段时间后下线。

youdao

"Our health and wellness committee provided us with pedometers and there was a contest to see how many people could log ten thousand or more steps each day over a certain period.

VOA: special.2011.02.28

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

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

Pre-liberalization, domestic insurers focused on high-income endowment policies (which pay a lump sum after a certain period).

CNN: Another Lease on Life?

"If a player is out for a certain period there is no point rushing it, " said Ferguson.

BBC: Striker search concerns Ferguson

If a dividend is not authorized for a certain period, no balance accrues.

FORBES: Why Warren Buffett Prefers Preferred Stock