alerting signal

例句：

1. 1. The police issued an alerting signal to warn everyone of the impending storm.
   警方发布了一个警示信号，提醒人们暴风雨即将来临。
2. 2.The traffic officer flashed his warning light as he approached the intersection.
   交通警察在接近十字路口时，闪烁了他的警告灯。
3. 3.The meteorologist issued a cautionary signal about the approaching hurricane.
   气象学家发出了一个警告信号，关于逼近的飓风。