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2000 Years Ago,Zhang Qian Was Finding The Secret Way to Across Himalaya,Now We Found It......

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地球上70%的黄土都集中在这里 黄土高原为何不像其他高原那样“坚固”？《航拍中国》第一季 陕西【CCTV纪录】

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全球最大的黄土高原 不止千沟万壑 还有最肥沃的土壤！《航拍中国》第一季 陕西【CCTV纪录】

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