Ключевые слова: air, blue, chemical, chemistry, chimney, clean, clouds, coal, construction, dark, dioxide, dusk, ecology, electric, electrical, electricity, energy, engineering, environment, environmental, factory, fuel, gas, generator, global, industrial, industry, metal, night, oil, pipe, plant, pollute, pollution, power, production, refinery, scene, sky, smoke, station, steam, steel, technology, tower, tranquil, tube, turbine, warming,