Ключевые слова: accuracy, background, car, chain, chainring, closeup, communication, concept, connection, crank, dark, dirty, dusty, energy, engine, engineering, equipment, gear, gearshift, gearwheel, group, grunge, ideas, industry, iron, link, lubrication, machine, machinery, metal, metallic, part, pinion, power, sport, sprocket, stainless, steel, strength, teamwork, technology, teeth, transportation, vehicle, wheel,