亚历山大港在尼罗河三角洲西边。尼罗河的泥沙比黄河长江少得多。都江堰不经常维护一百年不到就报废了。

来源: rulvbobing 于 2024-06-29 02:32:27 [旧帖] [给我悄悄话] 本文已被阅读：次

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