alternating current mains
交流电源
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Mains electricity in America is supplied as alternating current at 60 Hertz.
在美国，主要供应频率为60赫兹的交流电。
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Their job is to convert high-voltage alternating current from the mains into low-voltage direct current for mobile phones, laptops, iPods and other electronic gadgets.
ECONOMIST: How a boring gadget saved $2 billion-worth of electricity
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