N-COUNT A sewer is a large underground channel that carries waste matter and rain water away, usually to a place where it is treated and made harmless. 下水道
V to provide with sewers 为...铺设污水管道
sewer pipe 污水管；下水管
sewer system 污水管道系统
He must have been familiar with the enormous madrepore of the sewer.
The most surprising rencounter was at the entrance to the Grand Sewer.
He would tell her, "Oh, sinful wretch, who is spreading disease and filth like an open sewer."