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
...the city's sewer system.
…该城市的下水道系统。
V to provide with sewers 为...铺设污水管道
V
N a person or thing that sews 缝纫工或缝纫机
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