self-activated switch

例句：

1. 1. The new car has a self-activated switch that makes starting the engine easy.
   这款新车有一个自激活开关，使启动引擎变得简单。
2. 2.The old house had a self-activated switch that could be used to turn off the lights.
   这所旧房子有一个自激活开关，可以用来关闭灯。
3. 3. In the workshop, there is a self-activated switch that controls the temperature in the room.
   在车间里，有一个自激活开关，可以控制房间的温度。