Even when we turn off the bedside lamp and are fat asleep, electricity is working for us, driving our refrigerators, heating our water, or keeping our rooms air-conditioned.
即使当我们关掉了床头灯，深深地进入睡乡时，电仍在为我们工作，它帮我们开动冰箱，帮我们烧水或使我们房间里的空调机保持运转。
It will then spring into life, heating itself and in some cases even welcoming you to the bathroom.
然后它会触发自动程序，开始自己加热，有时甚至会欢迎你来到浴室。
Even in the cleanest of homes, air-conditioner griller, heating grates, and fan blades eventually develop a layer of dust and grease.
即使在最干净的房间，空调格栅，加热箅子和风扇扇翅也会产生灰尘和油污。
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