The average population density of the world is 47 persons per square mile.

世界平均人口密度为每平方英里47人。

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Low average population densities are characteristics of most underdeveloped countries.

平均人口密度低是大多数不发达国家的特点。

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Despite its more relaxed regulations, the county has a lower-than-average population growth rate.

尽管控制更为宽松，但是该县的人口增长率却低于平均水平。

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We could have gone on and studied the average at-risk population for decades and centuries.

我们本可以继续研究几百年来的,平均受危人群。

哈佛公开课 - 幸福课课程节选

This is very important,which is why I am doing it: "If we want to know how fast a human being can run, then it is no use to average out the speed of a "good sample" of the population; it is far better to collect Olympic gold medal winners and see how well they can do.

这话非常重要，是我作这个研究的原因：,“如果想知道人类最快能跑多快，那从好的样本中测出平均数是“,没用的;,而应该收集田径类奥运冠军的信息,看他们能跑多快。

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Federal enjoys superior demographics with average population and household incomes nearly double its peers, says Donnelly.

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Despite its more relaxed regulations, the county has a lower-than-average population growth rate.

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Thanks to the simultaneous growth in the total world population, the average population of a country has not declined greatly: it is down from around 32m in 1946 to 29m today.

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