电插头

例句：

1. 1. The electric plug is easy to use and convenient for many household appliances.
   这个电插头使用起来简单，对于许多家用电器都很便利。
2. 2. The old phone was a simple plug-in device that could only make calls.
   那个旧电话是一个简单的插卡式设备，只能打电话。
3. 3. The engineer carefully inserted the new plug into the socket before turning on the light.
   工程师仔细地把新插头插入插座后，才打开灯。