单词：population density
population density的用法和样例：
例句
- The population density of the province is very low.这个省的人口密度很低。
- This region has a high population density.这个地区人口密度很大。
- The population density is evened out.种群密度亦趋于均匀化。
- Population density is a common geographical measurement.种群密度是一个常用的地理参数。
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