Ключевые слова: 20s, academic, adult, boy, career, caucasian, chalkboard, cheerful, child, childhood, children, class, classmates, classroom, desk, development, early, education, elementary, female, girl, group, happy, high, indoors, job, knowledge, learn, learning, lesson, looking, occupation, people, portrait, preschool, primary, profession, pupil, school, schoolchild, sitting, smiling, student, studying, teacher, teaching, woman, writing, young,