1 [U] the number of things or people in a place in relation to its area 密度(某地方的物或人的数目与该地方面积的关系):
There is a high density of wildlife in this area.这地区的野生生物密度很高。
2 [C,U] (technical术语) the relation of the weight of a substance to its size 密度(某物质的重量与所占空间的关系):
Lead has a high density.铅的密度很高。