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单词 silent alarm
释义

silent alarm in American English

noun
1. 
an alarm that alerts security personnel or the police without the knowledge of the intruder or criminal whose presence triggers it
The silent alarm set off a flashing light at the police station
2. 
any visual rather than audible alarm

Examples of 'silent alarm' in a sentence
silent alarm

But an employee activated a silent alarm, and the police arrived quickly on the scene.
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更新时间:2024/12/22 16:57:20