Ключевые слова: back, background, blackboard, board, chair, chalk, chalkboard, children, class, classroom, college, desk, educational, elementary, empty, exam, furniture, green, hall, high, horizontal, indoor, inside, interior, knowledge, learn, lecture, lesson, light, modern, nobody, primary, room, school, seat, seminar, student, study, table, teacher, teaching, training, university, white, whiteboard, window, wooden,