There are no roads, no cars, no sewage system.

没有道路，没有汽车，没有污水处理系统。

And how are samples affected by different sewage systems?

不同的污水处理系统对样本有何影响？

Sewage systems allowed us to develop into multi-million person cities.

下水道排污系统使得 数百万人口的城市得以出现。

Most of this pollution comes from wastewater in sewage systems, researchers say.

研究人员表示，大多数污染物来自下水道系统的废水。

They set cameras on floatation devices, which they put into the sewage system.

他们将摄像头安装在漂浮设备上，然后将其放入污水处理系统中。

The most pressing issue currently is a shortage of clean water supply and a broken-down sewage system.

目前，最紧迫的问题就是清洁水供应短缺、污水处理系统出现故障。

Schools, hospitals, factories, all part of the rebel. And the sewage system is totally destroyed.

学校，医院，工厂全部沦为叛军占领区域。而且整个污水系统被完全摧毁。

In places without access to large sewage systems, bacteria-laden human waste passes into septic tanks.

在没有大型污水系统接口的地方，负载细菌的人类粪便被冲进化粪池中。

Unlike cholera, which was eliminated in London by re-designing the sewage system in the 1850s, TB was airborne.

它与霍乱不同，19世纪50年代，伦敦通过重新设计污水处理系统消除了霍乱，而肺结核是通过空气传播的。

Nutrient-rich waste from our sewage systems and industrial processes often end up in lakes, estuaries and coastal waters.

我们污水系统和工业制造过程会产生一些富含营养的废弃物，它们通常最后会进入湖泊、河口，及沿岸水域。