名词

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