signalling prop

例句：

1. 1. The car's signalling prop was damaged in the accident.
   汽车的信号装置在事故中受损。
2. 2.The police used a flashing light as a signalling prop to alert drivers.
   警察使用闪烁的灯光作为信号装置来警告司机。
3. 3. The pilot used his signalling prop to communicate with the ground crew.
   飞行员使用他的信号装置与地面机组进行通信。