短語詞組短語threshold population inversion density 臨界粒子數(shù)反轉(zhuǎn)密度;閾值粒子數(shù)反轉(zhuǎn)密度population n density 人口密度;種群密度population inversion density 反轉(zhuǎn)粒子數(shù)密度population s density 種群密度inverted population density 反轉(zhuǎn)粒子數(shù)密度High population density 高人口密度equilibrium population density 種群的平衡密度population density detail 種群密度population density gradient 人口密度梯度 返回 population density