siren ·noun
Definition: a piece of equipment that makes a loud sound as a warning Level: C2
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.
在那本反乌托邦小说中，城市警报器不停的鸣响是对持续监视的冷酷提醒。
In the dystopian novel, the constant blare of the city ___siren was a grim reminder of the ongoing surveillance.