Ключевые слова: academic, adult, background, beautiful, casual, caucasian, chalk, chalkboard, chemistry, class, classic, classroom, college, concept, confident, cute, difficult, education, educational, explain, friendly, human, information, knowledge, learn, lesson, looking, man, occupation, person, portrait, professor, pupil, school, showing, smart, standing, student, study, studying, teach, teacher, text, university, work, young,