Visitors shop at an unmanned supermarket at the Garden Expo Park in Jiangning District of Nanjing, east China's Jiangsu Province, April 16, 2021. The 11th Horticultural Exposition of Jiangsu Province opened in Jiangning, Nanjing, on Thursday. Jiangsu Garden Expo Park is built on abandoned mine pits. Through the revitalization of industrial remains, the once abandoned mine has become an urban oasis where man and nature coexist harmoniously. (Xinhua/Ji Chunpeng)
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