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科技天地(粤语):人类钻探过最深的洞穴
Published
有说人类对太空的了解可能比对地球还要多,譬如我们对地球深处的认识依然匮乏。前苏联、美国等都试图探索距离地面几千米之下到底是个怎样的状态。专家指出,探索地底同探索太空一样重要。