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A tourist enjoys the inner scenery of Tieling Karst Cave in Huangqizhai Town of Kaiyuan, northeast China's Liaoning Province, June 17, 2019. (Xinhua/Yang Qing)
 
 
A tourist enjoys the inner scenery of Tieling Karst Cave in Huangqizhai Town of Kaiyuan, northeast China's Liaoning Province, June 17, 2019. (Xinhua/Yang Qing)