Ключевые слова: academic, acting, adult, attendance, audience, back, business, businessman, center, chair, classroom, coaching, collage, communications, conference, convention, corporate, crowded, education, equipment, event, full, group, hall, indoor, instructor, knowledge, learning, lecture, many, meeting, orator, participants, pass, people, person, presentation, professional, public, room, row, screen, seminar, sitting, speaking, study, teaching, training, university, work,