为防止水体富营养化，需要对三峡库区小城镇居民生活污水进行处理。

In order to prevent water eutrophication, sewage treatment in small towns is necessary.

youdao

为防止水体富营养化，需要对三峡库区小城镇居民生活污水进行处理。

In order to prevent water eutrophication, sewage treatment in small towns is necessary.

youdao