Ключевые слова: 3d, 67 years, 89 years, academic, blackboard, boy, boys, caucasian, caucasian ethnicity, chalk, chalkboard, child, childhood, classroom, computer graphic, cute, development, digital generated, early learning, education, elementary, elementary school, female, girl, girls, knowledge, learn, learning, male, mixedrace, mixedrace person, preschool, pupil, school, schoolchild, three people, white,