1. 不可数名词：人口
2. 可数名词：【一般用单数】（某一地区的）全体居民 英语解释
- a group of organisms of the same species populating a given area
- the people who inhabit a territory or state
- the number of inhabitants (either the total number or the number of a particular race or class) in a given place (country or city etc.)
- the act of populating (causing to live in a place)
- (statistics) the entire aggregation of items from which samples can be drawn