Ключевые слова: acoustic, alarm, alert, amp, amplifier, announce, attention, audio, broadcast, bunch, column, communication, danger, disaster, earthquake, electric, emergency, emit, event, high, horn, information, loud, loudspeaker, megaphone, message, mouthpiece, news, pair, pillar, pole, population, post, public, safety, signal, siren, sky, sound, speaker, station, storm, system, talk, tell, tower, voice, warning, weather,