Ключевые слова: audience, audio, auditorium, background, black, blur, broadcast, business, center, classroom, communication, concept, concert, conference, convention, education, equipment, event, guest, hall, interview, keynote, lecture, leisure, light, live, meeting, mic, microphone, modern, music, people, podium, presentation, professional, public, room, seminar, show, sound, space, speak, speaker, speech, stage, talk, teacher, university, voice, workshop,