Ключевые слова: abstract, auditorium, background, business, businessman, center, chair, college, concept, conference, convention, corporate, day, education, empty, event, group, hall, information, international, learning, lecture, line, meeting, nobody, presentation, professional, public, room, row, school, seat, seminar, show, speaker, speech, stage, study, summit, technology, training, university, vintage, working, workshop,