Ключевые слова: back, background, blackboard, boy, caucasian, cheerful, child, childhood, children, class, classmates, classroom, desk, education, elementary, girl, group, happy, horizontal, indoors, kid, kids, kindergarten, learning, lecture, lesson, little, looking, mathematics, people, person, preschool, primary, pupil, school, schoolgirl, sitting, smile, smiling, student, studying, teacher, teaching, together, uniform, view, white, woman, writing, young,