是这样的说法，沙子是从别处吹来的，被山挡住了，经数千万年的堆积就成了今日的沙丘。

来源: 山里人家168 于 2022-07-14 14:59:19 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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