青海發現15萬年前的鐵管，9人專家組奔赴調查，誰留下的遺蹟？【文昭思緒飛揚273期】
Synopsis
一個考古小分隊，在青海柴達木盆地，意外發現了一些鐵管。鐵管有什麼稀奇的？但是，這些鐵管卻很特別，因為它們不是這期人類 ...
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