Naijing lies on the Changjiang River and has a population of more than four million.

问题描述:

Naijing lies on the Changjiang River and has a population of more than four million.
为什么这里用的是a population of,不是特指南京的人口,不是应该用the吗?

这里没有特指的意思,而且have a population of 是固定搭配,你记住它就可以了,写作文时很好用的