如果有人对短信革命的到来表示怀疑，那就想想看：据尼尔森公司的数据，13至17岁的人平均每月收发3339条短信——每天超过100条。

For anyone who doubts that the texting revolution is upon us, consider this: The average 13-to 17-year-old sends and receives 3,339 texts a month—more than 100 per day, according to the Nielsen Co.

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伯克希尔公司表示，这些期权的加权平均剩余期限是14年。

Berkshire says the options have a weighted average remaining life of 14 years.

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这表示时间间隔内所有完成事务的平均事务时间。

This represents the average transaction time for all transactions completed in the interval.

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And to measure the intensity of unequal sharing, we take the difference in electronegativity, which I am going to use the Greek symbol chi for.

要度量非平均的程度，我们考虑电负性的差异，我要用希腊语第22个字母chi来表示电负性。

麻省理工公开课 - 固态化学导论课程节选

So, the two most elementary ideas you learn are what is the average velocity of an object, as then ordered by the symbol v-bar.

你们学过的两个最基本的概念是,物体的平均速度,用"v拔"表示

耶鲁公开课 - 基础物理课程节选