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Undated file photo provided by Zhengzhou Municipal Institute of Archaeology shows the bone spicule unearthed in the Shuanghuaishu Remain in Gongyi City, central China's Henan Province. (Xinhua)
Undated file photo provided by Zhengzhou Municipal Institute of Archaeology shows the bone spicule unearthed in the Shuanghuaishu Remain in Gongyi City, central China's Henan Province. (Xinhua)