air siren

基本解释

On the back seat the thing in the basket began to cry; the air raid siren wail of the newly born. High.
车后座上那个篮子里的东西开始哭起来；就像是宣布新生命诞生的那种空袭警报：古老，高亢，无意义。
As a token of our sadness for the sufferings bore by the disaster zone people, we stood in the shape of a heart. At 2:28pm, air siren and car horns filled the city.
这次活动在学校的鉴主广场举行，为了表达我们对灾区人民的哀思，我们站成心型，在2点28分整，汽车鸣声，防空警报顿时全城响起。
treasure.1x1y.com.cn
Adding to the surreal atmosphere in Harrisburg that day was the sounding of an air raid siren that rang out through the capital city.
那天，除了哈里斯堡诡异的气氛外，空袭警报声一直传到首都。

In which case a recording of an air raid siren would do it.
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