Ключевые слова: 20s, attentive, caucasian, cheerful, chinese, class, classmates, college, computer, concentrating, education, female, focused, happy, indoors, knowledge, laptop, learn, learning, lecture, lecture hall, listening, male, man, mixedrace, notebook, smiling, student, students, study, taking notes, technology, typing, university, using, wireless, woman, young adult,