Ключевые слова: 20s, academic, black, book, boy, career, casual clothing, caucasian, cheerful, child, childhood, chinese, class, classmates, classroom, cute, development, early learning, education, elementary, elementary school, female, happiness, indoors, job, knowledge, learn, learning, lesson, looking at camera, male, multi ethnic group, occupation, preschool, profession, pupil, school, school supplies, schoolboy, schoolchild, schoolchildren, schoolgirl, sitting, smiling, standing, student, studying, teacher, teaching, woman, young adult,