Ключевые слова: application, attractive, background, backpack, bag, beautiful, book, browsing, campus, casual, chatting, cheerful, college, communication, digital, education, female, girl, happy, holding, learn, learner, lesson, messaging, mobile phone, modern device, notebook, outdoors, phone, play, portrait, primary, school, schoolgirl, sending sms, sitting, smart, smile, smiling, social, student, study, technology, teenager, university, using, virtual, woman, young,