来自 sew,排污，排水，-age,名词后缀。

1. Sewage nutrients do increase algal growth in the harbour.

污水中的营养物确实会加快港口的海藻生长。

2. It was many years before the city began to treat its sewage.

很多年以后这个城市才开始处理污水。

3. Cities upstream use the river to get rid of sewage.

上游的城市将污水排放到河里。

4. Discharge of raw sewage into the sea is unsanitary and unsafe.

把未经处理的污水排放到海里既不卫生也不安全。

5. The sea is coated with a film of raw sewage.

海面上漂浮着一层未经处理的污水。