都江堰真是中華民族的傑作，自豪。要了解它的設計原理，因勢利導，而不是人定勝天。偉大！

來源: shparis 於 2025-12-10 08:43:53 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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