Ключевые слова: 2529 years, bag, beijing, black hair, casual clothing, china, chinese ethnicity, color image, communication, commuter, concentration, connection, day, enjoyment, focus on background, full length, glass, holding, human body part, human hand, incidental people, looking down, mobile phone, on the move, on the phone, one person, passenger train, photography, series, short hair, side view, sitting, smiling, text messaging, train, transportation, travel, vehicle interior, vertical, window, wireless technology, young men,