They may focus on a certain country or a certain time period when they begin their collections.

当他们开始收集时，他们可能会关注一个特定的国家或特定的时间段。

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Another way to filter the data is to get only the data that changed over a certain time period.

过滤数据的另一个方法是只获取那些在一段时间内更改过的数据。

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This method has the same method signature and returns all the records deleted over a certain time period.

这个方法有着与 getUpdated 同样的方法签名并会返回在某个时间段内被删除的所有记录 。

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"And what happens is we have mazes and the children are able to organize the robots and see if they can get them through the maze within a certain time period."

VOA: special.2010.07.28

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

The court authorized SEBI to seize Sahara properties if the company failed to repay the money within a certain time period.

WSJ: India Moves Court to Detain Sahara Chairman

"Use-by" dates apply to food that goes off quickly, such as meat products, which may put health at risk if eaten after a certain time period.

BBC: Should you smell food before throwing it away?

Retail investors holding China through popular exchange traded funds like the iShares FTSE China Xinhua 25 (FXI) are better off buyin puts (right to sell at a certain price within a certain time period), or if they are new buyers of FXI, program stop losses, which of course is free of charge.

FORBES: Ways To Hedge A China Hard Landing