siren [ˈsaɪrən]

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n.汽笛，警报器，迷人的女人，妖妇

a device for making a loud warning noise

The cars had stopped at the sound of the approaching siren. 这些汽车听到愈来愈近的警笛声便停了下来。
That woman is a real siren. 那女人真是条美女蛇. 。