Ключевые слова: background, business, chemical, conduit, duct, dusk, energy, engineering, evening, exploration, factory, fossil, fuel, gas, gasoline, industrial, industry, installing, metal, metallic, natural, oil, oilfield, petrochemical, petrol, petroleum, pipe, pipeline, piping, power, refinery, resources, shiny, silhouette, structure, sunset, supply, system, technology, tube,