Ключевые слова: abstract, backgrounds, ball, bearing, car, circle, close, closeup, cooperation, engine, engineering, equipment, factory, fuel, gear, generation, heavy, industry, interlocked, iron, machine, machinery, macro, manufacturing, material, mechanic, metal, metallic, motion, object, occupation, old, part, pinion, power, rusty, single, spikes, spinning, steel, strength, teamwork, technology, turning, up, vehicle, wheel, working,