the wailing of police siren
外边传来阵阵警笛声 siren sound comes from outside ; Outside from the siren
警笛声划破了夜晚的宁静。
Sirens pierced the silence of the night.
《牛津词典》
救火车刚刚停下，警笛声还在尖利地响着。
The fire engines were just pulling up, sirens blaring.
《柯林斯英汉双解大词典》
背景里有警笛声，所以我没听到答案。
There's a siren in the background so I missed the answer.
youdao
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