Ключевые слова: accuracy, background, big, car, circle, cog, cogs, cogwheel, concept, connection, cooperation, energy, engine, engineering, equipment, factory, gear, gears, gears in oil, gray, grease, greasy, group, industrial, industrial machine, industry, iron, large, lubricants, machine, mechanism, metal, motor, old, part, power, progress, retro, shaft, steel, technology, teeth, tire, transport, transportation, truck, vehicle, wheel, wheels, work,