回答

・water supply
・sewer services

①water supply
　例句：Water supply is the water which you can drink if you don't mind.
　　　＝如果你不介意的話可以喝水。

②sewer services
　例句：If you drink sewer services, maybe you get sick.
　　　　＝如果你喝污水，會對你造成傷害。

＊其他還有
　water and sewerage
　water supply and sewerage systems
　water and sewer services
　

有幫助｜0