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Photo taken on Jan. 4, 2020 shows a white porcelain ware of Tang Dynasty (618-907) displayed at an exhibition in a museum in Xi'an, capital of northwest China's Shaanxi Province. (Xinhua/Shao Rui)

Photo taken on Jan. 4, 2020 shows a white porcelain ware of Tang Dynasty (618-907) displayed at an exhibition in a museum in Xi'an, capital of northwest China's Shaanxi Province. (Xinhua/Shao Rui)