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