人口问题的英文：
population problem

I am quite certain that the population problem will be eased.
我肯定人口问题会缓和的。

The population is on the decline.
人口在减少。

The population is dwindling.
人口在逐渐减少。

Attach importance to the problem of population aging (an aging population )
重视老龄化问题

There was a swell in the city's population.
该市出现过人口膨胀。

The town has a population of ten thousand.
这个镇有一万人口。

It was a complex problem.
这是一个复杂的问题。

Is the problem that easy?
问题有那么简单吗?

This is a prime problem.
这是一个有关质数的问题。

These are the resolved problems.
这些是已经解决的问题。

The housing problem is bound up with the problem of gale controls.
住屋问题涉及租金控制问题。