n.污水；污物
The river was contaminated with sewage. 这河水被污水污染了。
The sewage pipes were choked with rubbish. 垃圾阻塞了污水管道。
The grave problem of public hygiene is connected with the inefficient sewage system of the city. 公共卫生方面的严重问题与该城低效率的污水处理系统有关。
Chemicals in the factory's sewage system have changed the ecology of the whole area. 这座工厂排出的化学物质改变了整个地区的生态。
