排水沟在户外，污水沿着街道流动。

Open sewers flow down the streets.

youdao

从道路或街道排除表面水被称为地表排水。

Removal of surface water from the road or street is known as surface drainage.

youdao

从道路或街道排除表面水被称为地表排水。

Removal of surface water from the road or street is known as surface drainage.

youdao