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