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loudspeaker [loudspeakers]▼(transducer)noun[UK: laʊd.ˈspiːkə(r)] [US: ˈlaʊd.ˌspikər]
megaphone [megaphones]▼(portable device used to amplify a person's voice)noun[UK: ˈme.ɡə.fəʊn] [US: ˈme.ɡəˌfoʊn]
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