Ключевые слова: accessory, accuracy, back, background, black, centimeter, child, class, closeup, college, design, education, equipment, geometry, inch, instrument, item, kid, knowledge, learn, learning, length, lesson, line, math, measure, measurement, measuring, metal, millimeter, nobody, object, office, one, precision, pupil, ruler, school, single, size, space, stationery, student, study, studying, supply, table, tool, university, work,