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沙漠被沙层覆盖，那么沙层下面隐藏着什么呢？
source link: https://tech.sina.com.cn/d/n/2020-01-14/doc-iihnzhha2295479.shtml
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新浪科技讯北京时间1月14日消息，据国外媒体报道，当人们提及“沙漠”概念时，多数人就会联想到撒哈拉沙漠跌宕起伏的沙丘，不断流动的沙丘尽收眼底。这是电影、电视节目和大众文化所描述的沙漠概念，但事实并非如此。的确，世界上的沙漠存在大量沙子，但这
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