Ключевые слова: arm, auto, automatic, automobile, automotive, background, black, car, chain, complex, drill, drive, driver, energy, engine, engineering, gear, gearbox, gearing, hard, industrial, industry, machine, machinery, machining, manufacture, mechanic, metal, metallic, motor, old, part, power, pulley, repair, robot, rotation, serrate, service, spring, sprocket, steel, technical, technology, torque, transmission, turbine, wheel, work, yellow,