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》

Houses blacked out during an air raid.

空袭时房屋实行灯火管制。

youdao

In an air raid last night the enemy aircraft bombed the city.

在昨晚的空袭中敌机轰炸了该城。

youdao

Colombia's armed forced have killed 13 guerrillas - including two leaders - in an air raid, officials say.

BBC: Aerial attack kills 13 Farc rebels in Colombia

The tunnel was used as an air raid shelter during World War II.

BBC: Derby

Their romance flourished, and she moved into his London flat after her home was damaged in an air raid.

BBC: Princess Lilian of Sweden: Swansea pays tribute