| 单词 | silent alarm | 
| 释义 | silent alarmn.  An alarm made without a sound; spec. a burglar alarm that gives no audible signal at the scene when triggered, but instead alerts a remote monitoring station.In quot. 1858   as a call to arms signalling a fight. ΚΠ 1858    N.-Y. Times 22 Mar. 5/1  				The fight between firemen..was resumed at 8½ o'clock last evening, at which hour a silent alarm for the Seventh District was given. 1958    Sci. News Let. 18 Jan. 48/3  				The alarm is designed for three-fold use: sounding off in its immediate area, flashing a silent alarm at a police station, and signaling a guard station. 2019    East Bay 		(Calif.)	 Times 		(Nexis)	 27 June  				Officers responded at 4:07 a.m. to a silent alarm indicating a..burglary was in progress. This entry has been updated (OED Third Edition, September 2020; most recently modified version published online March 2022). < | 
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