名詞 main:

1. any very large body of (salt) water
   同義詞：main, briny
2. a principal pipe in a system that distributes water or gas or electricity or that collects sewage
   同義詞：main

1. In electronics, undesirable low frequency currents interfering with a desired signal, and usually caused by a poorly screened alternating mains supply.
   在電子學(xué)領(lǐng)域，一種不希望發(fā)生的低頻電流，它干擾所要求的信號。通常這種現(xiàn)象是由于交流供電線路屏蔽不良引起的。
2. My new house is not yet connected to the mains.
   我的新房子還沒接上水、 電、 煤氣呢。
3. I turned the gas off at the mains before I went out.
   我出門之前，把煤氣的總閥關(guān)掉了。
4. The electricity supply has been cut off/disconnected at the mains.
   電力供應(yīng)已在電源處截斷。