Ключевые слова: athletics, background, black, chain, circle, closeup, cog, cogwheel, construction, detail, dirty, dredger, drive, earth, equipment, excavator, extreme, ground, heavy, industry, land, link, lubrication, machine, machinery, mechanic, mechanical, mechanism, metal, mountain, mud, muddy, oil, old, power, powerful, rack, roller, rubber, soil, spring, sprocket, steel, technology, track, transport, vehicle, wet, wheel, work,