switchel

例句：

1. 1. The engineer switched on the lights in the factory.
   工程师在工厂里打开了灯。
2. 2.The switchel was designed to automatically turn off the lights when they were left on for too long.
   开关箱被设计成当灯光长时间开启时会自动关闭。
3. 3.The switchel is located in the basement of the building.
   开关箱位于建筑物的地下室。