They raise alarm for help.
他们发出警报求助。
sound a note of alarm/danger/warning
发出警报[危险信号/警告信号]
warning lead time
从发出警报到真正发生事件的时间
Alarm calls were placed to central district police and fire units first.
首先向市中心区警察当局和消防队发出警报。
I raised the alarm as soon as I saw the smoke.
我一看见冒烟就发出警报。
The doorkeeper gave the alarm as soon as he saw the smoke.
守门人一看见冒烟就发出警报。
alarm and trip mechanism
警报发出和解除机构
The computer triggers a "conflict alert."
计算机会发出“碰撞警报。”
A bell used to sound an alarm.
警钟用于发出这种警报的钟
Smoke sensors warned us of the fire.
烟雾探测器已向我们发出火警警报.
a loud warning signal produced by a burglar alarm.
夜盗警钟发出的响亮的警报信号。
Once a thief gets into the garage, the alarm will ring.
只要有贼进入仓库, 警报器就会发出报警声。
The radio gave a warning of bad weather.
广播电台发出了坏天气的警报。
Together we had done our best to sound the alarm.
我们曾一同竭尽全力发出过警报。
This alarm immobilizes the car.
这种警报一发出, 汽车就停止不动了.
The Weather Bureau issued a typhoon warning on the ocean.
气象局今阿日发出海顶耶风颱警报。
a warning signal that is a loud wailing sound.
发出响亮尖利声音的警报信号。
It may move about nervously and sound alarm calls.
它会乱跳飞鸣，发出报警叫声。