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Ключевые слова:
air, air pollution, architecture, atmosphere, background, blue, boiler, boiler room, building, business, chemical, chemistry, chimney, city, climate, construction, danger, ecology, energy, environment, environmental, factory, fuel, gas, global, global warming, heat, heating, industrial, industry, out of focus, pipe, plant, pollution, power, production, red, room, season, sky, smog, smoke, steam, technology, tower, urban, vapor, warming, white, winter,