Ключевые слова: accessory, back, background, centimeter, child, class, closeup, college, color, design, education, element, equipment, geometry, grey, item, kid, knowledge, learn, learning, length, lesson, light, math, measure, measurement, measuring, millimeter, nobody, object, office, one, pupil, ruler, school, stationery, student, study, studying, supply, tool, university, wooden, work,