分离: 1.(分开) separate; sever; resolve; segregate; isolate; detach; dis(as)sociate; abstrict 短语和例子从空气中把氮分离出来 separate nitrogen from air; 男女生分离的教育制度 an educational system where boys and girls are
密度: 1.(密集的程度) density; thickness 短语和例子火力密度 density of fire; 兵力密度 density of troops; 那个国家的人口密度为每平方英里685人。 the population density of that country is 685 per square mile.2.[物理学] (物体的质量和其体积的比值) de
