bulhorn

例句：

1. 1.The policeman used his bulhorn to warn the crowd of the approaching traffic.
   警察用警笛警告人群注意即将到来的交通。
2. 2. The firefighters used their hydraulic bulhorns to signal for help.
   消防员使用液压警笛发出求救信号。
3. 3. The driver blew his horn to alert other drivers to slow down.
   司机按响喇叭提醒其他驾驶员减速。