Description: Nature ( Environment ) itself has a certain degree of self - purification capacity.

说明: 大自然 ( 环境 ) 本身具有一定的自净能力.

互联网

The concrete river regulation work has weakened the self - purification capacity of the rivers in the city.

混凝土“包”起来的河道治理工程导致城市河流 自我 净化能力降低.

互联网