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smoke alarm

noun
🔊/ˈsməʊk əlɑːm/
🔊/ˈsməʊk əlɑːrm/
(also smoke detector)
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  1. a device that makes a loud noise if smoke is in the air to warn you of a fire烟雾报警器（用于预防火灾）Topics Houses and homesb2