This combo file photo shows polished stone tools unearthed from the Dadong Paleolithic site in Helong city, one of the cluster of Paleolithic sites in the Changbai Mountains in northeast China's Jilin province. [Photo/Xinhua]
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This combo file photo shows polished stone tools unearthed from the Dadong Paleolithic site in Helong city, one of the cluster of Paleolithic sites in the Changbai Mountains in northeast China's Jilin province. [Photo/Xinhua]
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