目的分析淮河流域水污染更加严重的原因，提出消除水污染的建议。

Aim to analyze the reason that pollution of Huaihe River valley are getting more serious, to give advices to reduce water pollution of Huaihe River valley.

youdao

目的分析淮河流域水污染更加严重的原因，提出消除水污染的建议。

Aim to analyze the reason that pollution of Huaihe River valley are getting more serious, to give advices to reduce water pollution of Huaihe River valley.

youdao