Ключевые слова: adolescence, applauding, asian, boy, boys, cheerful, clapping, class, classroom, congratulating, depression, discussion, education, female, geometry, girl, group, group of people, happiness, kid, knowledge, learning, lesson, lifestyles, math, men, pupil, schoolchild, smart, smiling, standing, student, studying, support, talking, teamwork, teenage girl, teenager, university, vietnamese, women,