The region has a very high population density.
这一地区人口密度很高。
The density of population in this city is very high.
这个城市的人口密度非常高。
Because the wires are very fine, the density of the electrical current is high.
由于导线很细，电流的密度非常之高。
Because the wires are very fine, the density of the electrical current is high.
由于导线很细，电流的密度非常之高。
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