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TOEFL BNC: 3745 COCA: 4513

density noun [ C or U ] THICKNESS

C1 also denseness the number of people or things in a place when compared with the size of the place(人口等的)密度

The area has a high/low population density.该地区人口密度大/小。
We were unable to move because of the density of the crowd.人太多,我们根本就动不了。

density noun [ C or U ] OF MATTER

specialized physics the relationship between the mass of a substance and its size(物质的)密度

Lead has a high density.铅的密度大。
Aluminium is low in density.铝的密度小。

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