(输送水、电的)管道系统;下水道系统
the system of pipes or wires that carry water or electricity into a house, or the pipes that carry sewage away from a house
The house isn't on the mains. 这座房子尚未接上管道系统。
They bought a house with no mains supply. 他们买了一套没有通水电的房子。
mains electricity 供电系统的电力
Not all the houses in the village are connected to the water mains.
There are many miles of sewage mains that are so old they are beginning to fail.
See also: main noun (PIPE)