If you say 20 milliseconds, you might get called in 25 milliseconds one time, then a second later the next time.

如果规定20毫秒，但实际上可能第一次在25毫秒时调用，下一次却要等到一秒钟以后。

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The bird closes its eyes. Just then, a drop of water falls on its head. Then, a second later, another drop falls on its tail.

小鸟闭上眼睛一会儿。就在这个时候，一滴水珠掉在它头上。接着马上又有一滴水落在它的尾巴上。

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In a second experiment, the researchers surveyed pairs who had just met in a college classroom setting, and then surveyed the same pairs later.

在第二项实验中，研究人员调查了大学教室里初识的人，一段时间之后又对他们进行调查。

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The first step uses a bit of influenza DNA to get the patient's immune system to begin fighting off the flu, and then the protection is given a "boost" some time later by the second step, which can be either another bit of DNA or a conventional flu vaccine.

VOA: standard.2010.07.21

Khan was caught cold by Prescott, hitting the canvas for the first time after just 30 seconds and then for a second time moments later before being counted out.

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There are, however, cases in which the cardiologist will want to place one and then place a second or even a third stent in a later procedure.

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Kroos hit the post in the 32nd minute then made the second goal seven minutes later with a diagonal pass to Eren Derdiyok, who headed past Jens Lehmann from eight meters.

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