Ключевые слова: 10s, 12s, activity, american, boy, caucasian, child, childhood, children, class, classmate, classroom, cognition, desk, disciple, education, elementary, emotion, english, european, german, indoor, intelligent, knowledge, learning, lesson, male, person, portrait, primary, pupil, school, schoolboy, schoolchild, schooling, schoolkid, sitting, study, studying, swede, young,