siren

他听到了远处传来的警笛哀鸣声。

He heard the police ___siren wailing in the distance.

警笛的哀嚎划破了夜空。

The wail of a police ___siren cut through the night air.

当测试警报响起时，请冷静地前往避难所。

When the test ___siren sounds, please proceed calmly to the shelter.