emergency braking tone

例句：

1. 1. The car'semergency brake was activated when the driver sawthe oncoming traffic.
   当司机看到迎面而来的交通时，汽车的紧急制动器被激活了。
2. 2. The fire department used anemergency signal to alert the nearby buildings ofthe imminent danger.
   消防部门使用紧急信号来警告附近的建筑物即将发生的危险。
3. 3.During a sudden drop in air pressure,the plane's emergency system kicked into prevent the passengers from panicking.
   在突然气压下降的情况下，飞机的紧急系统启动，以防止乘客恐慌。