Several of these flow into a branch sewer, which joins first a sub-main and then a mainsewer 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。
2
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。
3
Stranger One: "Hank" : On a street near my house, they have been repairing a faulty sewermain and a slightly older gentleman holds the "SLOW" sign to signal to the cars passing by.