在空中滞留连续25秒以上(在直升飞机中不算)。

Spend at least 25 consecutive seconds in the air (helicopters don't count).

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谷歌的一项研究表明，如果一家网站的网速比同类别网站慢于250毫秒以上，人们就不会经常访问这个网站了。

People visit websites less often if they are more than 250 milliseconds slower than a close competitor, according to research from Google.

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然而，这些不良影响基本是在运动员每次拉伸保持60秒以上并且不做进一步的热身马上开始充分运动的情况下才发生。

Those undesirable effects were generally found, however, only if each stretch was held for more than 60 seconds and the subject then immediately became fully active, with no further warm-up.

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But for those of you that have been here for 30 seconds or longer see if you can get the right answer in here.

但那些已经来了30秒以上的同学,看看你们能不能得到正确的答案。

麻省理工公开课 - 化学原理课程节选