preflashing

例句：

1. 1. The car's headlights are preflashing before it reaches the next intersection.
   汽车在到达下一个十字路口之前，前灯正在闪烁。
2. 2. The police officer was preflashing his lights to guide the pedestrians.
   警察用前灯引导行人。
3. 3. The driver had to preflash his hazard lights before entering the tunnel.
   司机在进入隧道前必须提前闪烁危险警告灯。