in a way that contains a lot of people, things, plants, etc. with little space between them 密集的;稠密的 a densely populated area 人口密集地區 densely covered/packed 蓋得/塞得嚴實的
in a way that is difficult to understand because it contains a lot of information (信息量大得)難理解的,難懂的 a densely written volume 寫得很密的一卷