Ключевые слова: academic, audience, auditorium, background, blurred, briefing, business, businessman, center, concept, conference, congress, convention, corporate, education, event, formal, forum, group, hall, indoors, information, institute, knowledge, learn, lecture, listeners, listening, manager, meeting, participants, people, presentation, professional, rear, room, row, seat, seminar, session, sitting, study, studying, tie, training, university, unrecognizable, view, watching, workshop,