1. The waste material and water carried in sewage.
    污水,污物从下水道中排出.

2. As the sewer system collapses, people will dump sewage on the streets where rain will eventually wash it away.
    由于下水道坍毁，人们将污水倒在街上，最后被雨水冲走。

3. Piles of garbage and raw sewage would create epidemics, perhaps even recurrences of plague.
    一堆堆垃圾和未经处理的污物可能引起流行病，甚至会再发生瘟疫。

4. sewage disposal into the sources themselves, leakage of sewage into distribution systems or contamination with industrial or farm waste.
    污水排入水源，污水渗入给水系统或工农业污水造成污染。

5. For example, dirty sewage (污水沟系统) water from homes and factories must not mix with drinking water.
    例如：从家里和工厂里排放出来的污水是绝不可和饮用水混在一起的。