Ключевые слова: apple, back, background, blackboard, book, books, bookshelf, building, chair, childhood, classroom, desk, education, elementary, focus, group, hall, hardcover, high, home, indoors, industry, intelligence, large, learning, lecture, library, literature, material, objects, office, old, paper, people, reading, research, school, science, seat, selective, stack, student, studying, table, teaching, textbook, wisdom, wood,