The town of Xenia didn't even have a warning siren.

而齐妮亚镇甚至没有警报器。

youdao

A warning siren indicates workers must retreat from the blast site.

警报提醒工人必须撤离爆破区。

youdao

Eventually I heard over my radio that the detonations were imminent. Warning shots and a siren gave a moment's alert.

终于，我听到了收音机里宣布爆破即将开始的声音，鸣枪示警和汽笛警告使人一阵警觉。

youdao

Jersey's emergency services are assessing how to get out information when a warning siren sounds.

BBC: Jersey warning siren causes rethink of procedures

Even today, over six decades later, just hearing that long wail of the warning siren on old newsreels and films gives me that same cold knot of fear in the pit of my stomach which I always felt all those years ago.

BBC: Stanley Ross remembers the Blitz

This time we had a warning like a blaring siren.

CNN: Bush's answer to 'Why Iraq?'