Ключевые слова: business, chemical, chemistry, chimney, coal, construction, dark, distillation, distillery, dusk, ecology, economic, electric, energy, engineering, environment, exterior, factory, gas, industrial, industry, light, management, metal, night, oil, petrochemical, petrol, petroleum, pipe, pipeline, plant, pollution, power, produce, production, refinery, source, steam, support, system, technology, tower, tube, twilight, voltage,