The area have a population density of five people per square mile.
该地区人口密度为每平方英里五人。
The density goes down exponentially with height.
分子密度随着高度的上升而指数衰减。
The increasing population density will even further congeal traffic.
日益增加的人口密度将使交通更加瘫痪。
This wave of excess density is sound.
这种过剩密度的波就是声波。
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