Ключевые слова: address, alarm, alert, announce, announcement, attack, audio, backgrounds, blue, cable, clouds, cloudy, communicate, communication, concert, cone, control, copy, crowd, danger, electronic, electronics, emergency, event, high, horn, inform, information, listen, loudspeaker, mass, megaphone, message, nobody, pole, public, report, siren, sky, sound, space, speaker, storm, system, tall, warn, warning, weather,