The factory treats its wastewater before it goes to the river.
工廠在廢水進入河川前會先處理。
Our school teaches us how to reduce wastewater at home.
我們的學校教我們如何在家中減少廢水。
The city built a plant to clean wastewater from houses.
這座城市建了一座工廠來淨化住家產生的廢水。
Please don't pour oil into the sink, because it makes more wastewater.
請不要把油倒進水槽，因為那會產生更多廢水。