Ключевые слова: alert, amp, amplification, amplifier, announce, audio, background, broadcast, bunch, call, column, communicate, communication, cutout, dirty, electric, electronic, information, isolated, isolation, loud, loudspeaker, magnify, many, megaphone, message, microphone, new, old, outdoor, pa, pair, pillar, post, power, public, rusty, shout, sound, speak, speaker, station, system, talk, tell, vintage, volume, warning, white, wire,