Ключевые слова: air, blue, business, chemistry, chimney, composition, construction, dark, design, distillation, energy, engineering, environment, equipment, fuel, gas, gasoline, global, heavy, industrial, industry, light, metal, night, oil, oil refinery, petrochemistry, pipe, pipeline, plant, pollution, power, production, repair, sky, smoke, station, steel, sunset, tank, technology, tower, tube,