double switch

例句：

1. 1. The double switch is used to control the lights in a room.
   双开关用于控制房间的灯光。
2. 2. The double switch was designed to be easy to use and maintain.
   双开关设计为易于使用和维护。
3. 3.The double switch can be found on many household appliances, such as air conditioners and washing machines.
   双开关可以在许多家用电器上找到，如空调和洗衣机。