Ключевые слова: adult, anger, angry, background, blackboard, book, caucasian, chalk, child, class, classroom, college, confident, crazy, desk, education, educational, emotion, emotional, expression, face, female, green, learn, learning, lecture, lesson, looking, mad, man, mathematic, mature, occupation, person, portrait, prof, school, serious, stress, strict, student, study, studying, teacher, teaching, tutor, university, white, woman, young,