Ключевые слова: adult, beautiful, black, blackboard, board, book, casual, caucasian, chalk, chalkboard, cheerful, class, classroom, college, concept, desk, education, female, girl, green, happy, indoors, knowledge, learn, lesson, male, man, one, people, person, portrait, professional, school, science, smile, space, standing, student, study, studying, teach, teacher, teaching, university, white, work, write, writing, young,