Ключевые слова: air, architecture, blue, chimney, coal, construction, damage, damaged, danger, dirty, electricity, environment, environmental, equipment, factories, factory, flowing, fossil, fuel, fumes, garbage, generation, generator, industry, machinery, metal, mining, nature, outdoors, physical, pipe, pollution, power, refinery, river, smoke, stack, steam, steel, structure, supply, technology, toxic, tube, unhygienic, waste, water, working,