Ключевые слова: abstract, adult, black, book, business, cellphone, closeup, computer, content, couch, desktop, digital, document, e, ebook, education, electronic, fashion, happy, holding, internet, knowledge, learn, library, lifestyle, literature, magazine, man, online, paper, phone, portrait, publication, read, reader, readers, reading, research, screen, smart, smartphone, social, software, studying, tablet, teaching, tech, technology, textbook, using,