Ключевые слова: ability, app, background, bead, block, blur, book, bookmark, bookstore, business, college, colorful, computer, concept, course, culture, data, datum, digital, document, ebook, education, information, inside, internet, knowledge, learn, library, literature, media, object, online, paper, read, reference, research, resource, school, science, search, shop, store, study, symbol, textbook, university, web, wisdom, word,