three-way switch

例句：

1. 1.The three-way switch controls the lighting in this room.
   这个房间的灯光由三向开关控制。
2. 2. The three-way switch allows for easy switching between different circuits.
   三向开关便于在不同电路之间轻松切换。
3. 3. During power outages, we need to ensure that all three-way switches are functioning properly.
   在停电期间，我们需要确保所有三向开关都正常工作。