Ключевые слова: background, beautiful, blue, china, closeup, construction, crank, crude, derrick, economic, energy, environment, equipment, exploration, field, fuel, heavy, high, industrial, industry, manipulation, metal, oilwell, outdoors, petroleum, pipeline, power, pumping, pumpjack, red, resource, scene, silhouette, sky, storage, sun, sunset, supply, swing, technology, valves, work,