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1·The shaver will run off batteries or mains.

这个剃须刀可用电池或电源驱动。《牛津词典》

2·The electricity supply has been cut off at the mains.

电的供应在电源处被切断。《牛津词典》

3·The house is not yet connected to the mains.

这房子还没有通水电。《牛津词典》

4·The house is far from water mains and electricity and relies on its own generators.

这座房子远离自来水总管和供电网，依靠自备的发电机。《柯林斯英汉双解大词典》

5·Any fish is a good idea for mains, with chilli ginger dressing, spring onions and mustard cress.

任何一种鱼都是不错的主菜，搭配辣椒姜酱、葱和芥茉菜。

6·I turned the gas off at the mains before I went out.

我出门之前，把煤气的总阀关掉了。

7·We can just treat the whole blackboard as mains frames.

我们可以把整个黑板当做main的框架。

8·Avast! Belay the port jib, and scupper the mains 'l on the poop deck!

停住！把绳拴在港口上，用排水管排掉甲板和船尾的水！

9·Water mains are hard to inspect, particularly if they are underground.

供水主管道特别是地下管线很难监测。

10·The quake destroyed the city’s water mains, paralyzing the fire department.

地震破坏了输水管道，消防署也无能为力。

(1)mains frequency市电频率；电源频率

(1)mains supply市电电源；干线供给；交流电源

(1)mains voltage电源电压