Several of these flow into a branch sewer, which joins first a sub-main and then a main sewer taking it to the treatment plant.

这些街道污水管又相结一条污水支管。此支管与次干管连接，然后经主干管将污水送至污水处理厂。

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The plans show the drains and plumbing fixtures, but the plumber figures out how to route the pipes and hook up to the water main and sewer.

计划指出排水沟和排水管固定装置，而管道工则构想如何布置管道和连接到总水管和下水道。

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Stranger One: "Hank" : On a street near my house, they have been repairing a faulty sewer main and a slightly older gentleman holds the "SLOW" sign to signal to the cars passing by.

陌生人一号“汉克”：在我家附近的街道上，工人正在维修下水管道，一位稍微上了年纪的绅士为过路的车辆指出“慢行”的标识。

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No wonder, either, that every so often the private sector makes a mistake, as anyone can: this new water-main or sewer is not built on time, or lack of rainfall means that a reservoir is dry.

ECONOMIST: Third-world water and the private sector

Thames Water has also been working on a surface water sewer main in the street.

BBC: Reading Friar Street cracked road surface

This was the theory behind Canadian artist Peter von Tiesenhausen's decision to bury a sculpture almost four metres underground, beneath a sewer at the main crossroads in the city of Sarnia, Ontario.

BBC: Why make art no-one can see?