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》

The primary power supply is powered from the mains supply and energizes a lumped coil; the current ranges anywhere from 5 to125 amps.

主要的电力供给是来自市电电源并通过一个集合线圈激发；电流范围从5到125安培。

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In areas where there are water scarcity issues, if we can take our factories off the mains supply, then that means there is more water available for the local community.

在水资源匮乏的地区，如果我们的工厂可以不再依赖供水管道，那么当地社区获得的供应就会更多。

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The NEA wants government help to get more communities connected to the mains supply to cut fuel poverty.

BBC: Rural struggle without mains gas

We have had no mains supply for over 48 hours.

BBC: Water chaos affects thousands in Northern Ireland

In the 70s when I was away from a mains electricity supply, a 12-volt battery would keep my respirator operating for just 20 minutes.

CNN: 'I lived in an iron lung for seven years'