The population control is in the sense of keeping simultaneously the quantity of population in a moderate size to enlarge the quality of population continuously.

人口控制就是把人口数量控制在一个适度的范围内，同时不断提高人口质量。

youdao

The population control is in the sense of keeping simultaneously the quantity of population in a moderate size to enlarge the quality of population continuously.

人口控制就是把人口数量控制在一个适度的范围内，同时不断提高人口质量。

youdao