Ключевые слова: back, backpack, biracial, book, child, childhood, childhood education, class, classroom, college, concept, corridor, education, elementary, female, full, full length, girl, homework, kid, knowledge, learn, learning, length, lesson, mixedrace, one person, people, primary, pupil, rear, rear view, school, schoolboy, schoolgirl, student, study, studying, teacher, unaltered, university, view, walking,