“untreated sewage”簡單造句，untreated sewage造句子

It is neither sanitary nor safe to discharge untreated sewage into the sea.

The Liujiang River, which is the main source of drinking and industrial water use of the city, suffered from pollution from untreated sewage and rainwater flows.

Day after day, we pour millions of tons of untreated sewage and industrial and agricultural wastes into the world's water systems.