Ключевые слова: book, boy, caucasian, cheerful, child, childhood, class, classroom, college, concept, desk, education, elementary, elementary school, hand, happy, kid, knowledge, learn, learning, learning concept, lesson, little, male, one person, people, pupil, raising, raising hand, school, schoolboy, sitting, smiling, student, study, studying, teacher, university, vertical, white, young,