从工程的難度、強度、後續維護和實用看，我的笿定是當年建長城是為了拉動GDP，保持年增長率。

来源: Redfernbus 于 2015-12-17 15:22:23 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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