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.

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。

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The average rotational latency is one-half of a revolution of the disk platter.

平均旋转等待时间指的是磁盘旋转一半的时间。

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Rice paddies in the Senegal valley, for example, yield 50 percent more than the global average — and, unlike Asia, this chunk of the tropics has yet to see its green revolution.

比如，塞内加尔河谷的水稻产量比全球平均产量高50%，与亚洲不同，大面积的热带土壤可孕育出绿色作物。

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Before the 19th-century Industrial Revolution, the average carbon dioxide concentration worldwide was about 280 parts per million.

CNN: CO2 levels hit new peak at key observatory

This is not to excuse Mr Castro for his own brutality, but it is not surprising that, at least in the early years of the revolution, the average Cuban was firmly in his corner.

ECONOMIST: Forest harmony

Scientists estimate that the average acidity of surface ocean waters worldwide is now about 30% higher than before the Industrial Revolution.

BBC: Arctic Ocean 'acidifying rapidly'