Ключевые слова: book, business, classroom, cognition, collection, communication, concept, design, dictionary, education, english, flat, foreign, global, icon, icon set, icon symbol, illustration, international, language, learn, learning, lesson, library, line, online, outline, pictogram, school, science, service, set, sign, skill, speak, speech, student, study, studying, symbol, teacher, technology, text, thin, translate, translation, university, vocabulary, web,