Any electrical device -- an appliance, an extension cord, whatever -- must be able to tell the power outlet, "Hey, power outlet, I'm drawing too much current. Shut me off now, before I start a fire."
任何电子设备，一个电器，一根延长线，不管是什么， 必须要能告诉电源插座， “嗨，插座， 电流太大。现在就给我断电，免得我引发火灾。”