Ключевые слова: adult, audience, back, building, businessman, casual, caucasian, chair, children, classroom, clothing, crowd, desk, education, group, hall, high, indoors, large, learning, lecture, lifestyles, looking, males, man, men, other, people, presentation, professor, real, rear, school, schoolboy, science, seat, seminar, sitting, standing, student, studying, table, teacher, teaching, view, women, working, young,