crude sewage

例句：

1. 1. The factory discharges crude sewage into the river every day.
   这家工厂每天将粗制污水排放到河里。
2. 2. The city has implemented strict measures to control the crude sewage from factories.
   这个城市已经实施了严格的措施来控制工厂的粗制污水。
3. 3.To protect the environment, we need to treat the crude sewage before it reaches the sea.
   为了保护环境，我们需要在污水到达海洋之前对其进行处理。