Ключевые слова: adult, blank, book, bookshelf, bookstore, business, caucasian, cellular, college, communication, connection, defocused, device, display, education, hand, holding, indoors, information, internet, isolated, knowledge, learning, library, lifestyle, literature, looking, male, man, mobile, network, people, person, phone, portable, portrait, reader, research, school, screen, shelf, student, tablet, technology, telephone, university, view, young,