Ключевые слова: adult, advertisement, advertising, alert, amplifier, announce, announcement, attention, audio, authority, background, broadcast, broadcasting, bullhorn, business, colour, communicate, communication, crowd, direction, fat, form, gathering, graphic, guidance, horn, illustration, isolated, large, loud, loudspeaker, marketing, media, megaphone, message, noise, person, promotion, public, shape, shout, shouting, sound, speaker, speaking, speech, voice, volume, white,