Ключевые слова: background, black, business, chemical, construction, dark, distillery, energy, engineering, environment, equipment, factory, fossil, fuel, gas, gasoline, generation, horizontal, industrial, industry, letter, lowercase, machinery, natural, nature, oil, outdoors, people, petrochemical, petroleum, pipe, pipeline, plant, pollution, power, refinery, sky, steel, substance, technology, tower, toxic, transportation, tube, volume,