Ключевые слова: back view, boys, caucasian girl, childhood, children, classmates, classroom, desks, education, elementary age, elementary school, girls, kids, knowledge, learn, learning, lesson, looking at camera, people, preadolescent, preteen, pupils, rear view, school, schoolboys, schoolchildren, schoolgirls, schoolkids, sit, smile, smiling, students, study, studying, together, youth,