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 人口密集地区 densely covered/packed 盖得/塞得严实的
in a way that is difficult to understand because it contains a lot of information (信息量大得)难理解的,难懂的 a densely written volume 写得很密的一卷