黄河入海口泥沙淤积，很多土地低于海平面，防洪也是筑水坝，不能挖淤泥，海水倒灌会引起更大灾难

来源: 移花接木于 2024-09-04 18:04:39 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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