a sewage outfall的用法和样例：
- Operation of a sewage treatment works and a 300m long sewage submarine outfall.
- This paper also put forward appropriate profitable proposals to reduce sewage outfall pollution.
- Earlier, in 1989, a submarine sewage outfall was installed at the Cheung Chau Sewage Treatment Works, which proved effective in dispersing discharged effluent away from beaches.
- A sewage farm is like a hospital ward compared to your house.