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来自维基百科,自由的百科全书
警报器又稱警笛、警鈴,是一种可以发出巨大噪音的装置。警報器一般安裝在建築內外某個固定的地方。當遇到自然灾害、火災、恐怖襲擊、外敵入侵時警報器就會發出聲音。包括救護車、警察車輛和消防車在內的紧急服务车辆上也會安裝警報器。
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.