Ключевые слова: back, book, childhood, childhood education, class, classroom, college, concept, copy, copy space, cute, cute girl, design, education, eraser, girl, graphic, icon, illustration, knowledge, learn, learning, mobile, mobile phone, no people, notebook, paper, pen, pencil, phone, school, screen, sign, space, student, study, studying, symbol, technology, text, university, white, white paper, wireless, wireless technology,