英语翻译It was once thought that air pollution affected only the area immediately around large cities with factories and/or heavy automobile traffic.today ,we know that although these are the areas with the worst air pollution ,the problem is lit
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![英语翻译It was once thought that air pollution affected only the area immediately around large cities with factories and/or heavy automobile traffic.today ,we know that although these are the areas with the worst air pollution ,the problem is lit](/uploads/image/z/414404-44-4.jpg?t=%E8%8B%B1%E8%AF%AD%E7%BF%BB%E8%AF%91It+was+once+thought+that+air+pollution+affected+only+the+area+immediately+around+large+cities+with+factories+and%2For+heavy+automobile+traffic.today+%2Cwe+know+that+although+these+are+the+areas+with+the+worst+air+pollution+%2Cthe+problem+is+lit)
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