切换

例句：

1. 1. Please switch off the lights when youleave the room.
   当你离开房间时，请关掉灯。
2. 2. The computer has a built-in switch for turning it on and off.
   这台电脑有一个内置的开关，可以打开和关闭它。
3. 3. The switch is located onthe side of the door.
   开关位于门的侧面。