Ключевые слова: background, blue, book, books, color, concept, earphone, electronic, equipment, group, hardcover, headphone, headphones, headset, history, idea, information, knowledge, learning, leisure, library, listen, literature, media, music, musical, object, old, pile, play, reading, record, school, sound, stack, stereo, storytelling, study, studying, table, teaching, technology, textbook, white, wooden, work,