It is better in wet period, which only performs heavy pollution in 2.1 and 9 section.

丰水期的情况稍好，只有2.1断面和9断面表现为重污染以上。

youdao

It is better in wet period, which only performs heavy pollution in 2.1 and 9 section.

丰水期的情况稍好，只有2.1断面和9断面表现为重污染以上。

youdao