sewage stream的用法和樣例：
例句
- Sewage systems continue to overflow, forcing many beaches to close.
污水系統仍舊不堪重負，導致許多湖灘被迫關閉。 - The amount of water used by the community is therefore the figure used by the civil engineer when he is designing the sewage system for its minimum rate of flow.
因此，土木工程師設計污水系統時所用的最小流量就是居民區的用水量。
