Ключевые слова: adult, audience, back, business, businessman, caucasian, class, classroom, coaching, colleagues, college, conference, convention, corporate, education, explaining, forum, hall, high, institute, lecture, listeners, listening, male, man, manager, meeting, participants, people, person, presentation, professional, rear, seminar, sitting, spectator, student, students, study, studying, table, teacher, teaching, team, teenager, together, training, university, woman, workshop,