We're 500 feet from the main sewer line.

我们距离污主干道只有500英尺了。

The cholera epidemic began in Haiti near a camp for UN soldiers where there were leaking sewage pipes.

海地这场霍乱开始在联合国士兵营地附近，那里出现污泄露现象。

For this reason, Iranian civil engineers are interested in using it in structures as diverse as dams and sewage pipes and are working on improving it.

根据这个特点，伊朗土木工师把UHPC应用到从修建坝到铺设污各各 领域，并且不断地对其性能进行改进。

(b)Drains shall be of adequate size and, where connected directly to a sewer, shall be provided with an air break or other mechanical device to prevent back-siphonage.

(b) 排设备应有足够尺寸，在直连污地方应安装防止倒灌空气隔断或其他机械装置。

By the late 1880s, the city had become too dense with buildings, sewers, and electric cables for the " cut and cover" technique, so a new system had to be devised.

十九世纪八十代末，伦敦因楼房、污、和电缆外露而变得过于拥挤，原因是随挖随填技术，因此，人们需要设计新设备。