Ключевые слова: attention, audience, auditorium, background, briefing, business, businessman, center, communication, conference, congress, corporate, discussion, education, equipment, event, group, hall, indoor, interior, international, learn, learning, lecture, lecturer, male, man, manager, meeting, microphone, modern, new, people, person, presentation, professional, public, room, seat, seminar, speaker, speech, spokesman, training, work,