正確的答案就擺在那裏，工廠，發電廠，汽車尾氣是導致霧霾的主要因素。APEC藍怎麽來的？不就是停工，減少車流嗎？

來源: 相對強度於 2015-11-30 18:32:11 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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