Ключевые слова: back, background, blur, blurred, business, chair, chairs, children, class, classroom, college, contemporary, course, day, defocused, desks, education, elementary, empty, entertainment, equipment, exam, furniture, fuzzy, indoors, interior, kid, knowledge, learn, learning, lecture, lesson, modern, nobody, object, primary, pupil, room, school, schoolroom, seat, student, study, sunlight, table, teacher, teaching, training, university, view,