Ключевые слова: adult, ball pen, books, college, digital, education, fingers, glasses, hands, higher study, holding, indoors, internet, learning, library books, male, mobile, mobile phone, notebook, one, paper, pen, person, phone, pupil, room, school, selective focus, sitting, smartphone, stack of books, student, study, studying, table, technology, teenager, textbook, through the books, unrecognizable person, view, young,