Ключевые слова: adult, background, basic, black, blackboard, board, chalk, chalkboard, class, classroom, college, concept, education, english, female, foreign, hand, handwriting, high, international, knowledge, language, learn, lecture, lesson, letter, message, people, person, primary, professional, school, student, study, studying, subject, teach, teacher, teaching, text, university, white, woman, word, write, young,