Ключевые слова: arm, background, blurred, book, bookcase, bookshelf, bookstore, business, cell, cellphone, closeup, communication, device, digital, education, equipment, hand, hold, information, interior, internet, knowledge, learn, library, literature, mobile, network, paper, phone, public, research, school, science, screen, shelf, shop, smart, smart phone, smartphone, store, student, study, studying, technology, text, textbook, university, white, wireless, woman,