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Ключевые слова:
air, atmosphere, blue, burn, business, chemical, chemistry, chimney, cloud, column, contamination, diesel, dirty, ecology, electricity, energy, environment, environmental, factory, fire, flame, fuel, gas, gasoline, generation, gritty, grunge, hazard, industrial, industry, nature, night, oil, petrol, petroleum, pipelines, pollute, pollution, power, problem, refinery, smog, smoke, station, steel, tank, technology, tower, toxic, vertical,