signal plate

例句：

1. 1.The engineer inspected the signal plate to ensure it was functioning correctly.
   工程师检查了信号板以确保它正常工作。
2. 2. The car's signal plate is illuminated when the brakes are applied.
   汽车的刹车灯在踩下刹车时会亮起。
3. 3.The pilot used the signal plate to communicate with the ground control during the flight.
   飞行员在飞行中使用信号板与地面控制进行通信。