the mains
1.(distribution network)(水或煤气的)主管道, 总管道；(电力的)干线(网), 配电网
2.(place where supply enters building)(房子供水、供电或供气的)总开关
If you're given warning of a flood, turn off the electricity, gas, and water at the mains.如果你收到洪水警报, 请关掉家里电、气和水的总闸。
3.(point in wall)(墙上的)配电插座；电源
Make sure plugs are disconnected from the mains.务必断开插头与电源之间的连接。