Ключевые слова: 25s, 40s, 60s, adults, age, american, board, caucasian, chatting, class, clothes, coach, college, course, different, elderly, employees, european, faces, female, friendly, group, happiness, having, indoor, inside, institute, knowledge, listening, male, ordinary, people, person, positive, professor, refresher, relaxed, scheme, school, session, smile, student, study, table, taking, teacher, training, wellness,