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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Women average 34 nerve fibers per square centimeter of facial skin, while men only average 17 nerve fibers.

女性在每平方的表面皮肤上平均有34个神经纤维，而男性只有17个神经纤维。

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A landscape with an average of 45 people per square kilometre is ideal for sparking wildfires.

人口密度为45人每平方公里的风景区最容易发生森林火灾。

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The scientists say the average Arctic sea ice extent last month was about five million square kilometers.

VOA: special.2009.10.27

The study found an average ice cover of about fifteen million square kilometers in March.

VOA: special.2009.05.05

Since your boss, not you, controls how much sporty space you have around your desk, you might not be surprised to learn that the average square feet allocated per worker hasn't changed in two decades.

FORBES: Magazine Article

This strategy is being pursued in tandem with opening smaller-sized mobile stand-alone stores which increase average revenue per square feet, a key performance measure for this industry.

FORBES: Best Buy Continues To Diversify By Selling Geek Squad Services

That compares with an average of 87 per square mile nationwide.

WSJ: A One-Horse Town Down to Two People