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Photo taken on May 17, 2018 shows plants growing at the bottom of a giant karst sinkhole, also known as tiankeng, in Luoquanyan Village of Xuan'en County, central China's Hubei Province. (Xinhua/Song Wen)
Photo taken on May 17, 2018 shows plants growing at the bottom of a giant karst sinkhole, also known as tiankeng, in Luoquanyan Village of Xuan'en County, central China's Hubei Province. (Xinhua/Song Wen)