Ключевые слова: aircraft, auto, ball, ballbearing, bearing, chrome, chromed, circle, conveyor, drive, expressive, factory, glitter, heavy, industrial, industry, machine, machinery, manufacture, material, mechanic, mechanics, mechanism, metal, motor, movement, precision, racer, ring, rings, roller, rolling, round, scattering, service, silver, steel, still, technical, technique, technology, tool, train, transportation, wheel,