比如说：1 -What's the population of your city?你们城市有多少人?
-There are two million people living in this city,and two-thirds of the population are workers.有两百万,其中三分之二是工人.
2 也可以指其他动物的数量：The cat population has increased in this community in the last five years,在这个地区5年来猫的数量增加了.