Ключевые слова: baby, back, background, beautiful, beauty, black, blackboard, blank, board, caucasian, chalk, chalkboard, child, childhood, class, classroom, complex, concept, cute, education, empty, equation, formula, girl, hand, happy, idea, kid, knowledge, learn, lesson, little, math, ompound, people, person, physics, portrait, preschool, pretty, program, pupil, school, schoolchild, schoolgirl, smile, student, study, teaching, wunderkind,