C2 a device for making a loud warning noise警报器,汽笛
More examples
The siren signalled the approach of an ambulance .
In an emergency, the siren will be sounded.
(in ancient Greek literature) one of the creatures who were half woman and half bird, whose beautiful singing encouraged sailors to sail into dangerous waters where they died塞壬(古希腊神话中的海妖)
a woman who is considered to be very attractive, but also dangerous妖妇,迷人而危险的女人
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