Ключевые слова: app, background, book, college, communication, concept, desktop, educate, education, electronic, elementary, exam, exercise, grammar, guide, information, international, knowledge, language, laptop, learn, lesson, library, list, literature, object, office, online, paper, philology, phone, polyglot, prepare, read, school, self, skill, spanish, stack, student, study, subject, supply, table, teach, textbook, translate, tutorial, university, wooden,