公共卫生方面的严重问题与该城低效率的污水处理系统有关。

The grave problem of public hygiene is connected with the inefficient sewage system of the city.

youdao

公共卫生方面的严重问题与该城低效率的污水处理系统有关。

The grave problem of public hygiene is connected with the inefficient sewage system of the city.

youdao