Ключевые слова: adult, attention, auditorium, book, caucasian, class, classroom, college, conference, dentist, dentistry, doctor, education, event, female, group, hall, happy, health, illustrative edtorial, indoors, knowledge, learn, lecture, lesson, listening, looking, male, medic, medical, men, notes, pen, people, presentation, professional, professor, school, science, seminar, sitting, student, study, tablet, taking, training, university, woman, writing, young,