It sounds like an air raid siren.

这听起来像是空袭警报。

《柯林斯英汉双解大词典》

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。

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Then suddenly one day when the air raid siren was sounded the professor rushed to the air raid shelter his neighbours from the building.

然而有一天当空袭警报突然响起的时候，教授随着他的邻居一起迅速从大楼冲向空袭防空洞。

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Then suddenly one day when the air raid siren was sounded the professor rushed to the air raid shelter his neighbours from the building.

然而有一天当空袭警报突然响起的时候，教授随着他的邻居一起迅速从大楼冲向空袭防空洞。

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