Ключевые слова: acting, adult, audience, back, business, businessman, caucasians, center, chair, chairs, communications, conference, congress, convention, corporate, debates, education, equipment, event, explaining, group, hall, indoor, instructor, learning, lecture, listening, meeting, office, orator, participants, people, person, podium, presentation, professional, public, room, row, screen, seat, seminar, sit, speaker, table, teaching, training, view, work,