Ключевые слова: back, background, blackboard, blur, board, chair, chalkboard, class, classroom, cognition, college, desk, educational, elementary, empty, equipment, exam, floor, furniture, green, hall, high, indoor, inside, interior, knowledge, learn, lecture, lesson, light, modern, nobody, primary, room, school, seat, seminar, student, study, table, teach, teacher, training, university, wall, white, window, wood, wooden, young,