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People visit the Xingcheng ancient city in northeast China's Liaoning Province Feb. 20, 2019. Built in the 15th century, the ancient city wall of Xingcheng is one of the five best preserved in China. (Xinhua/Yang Qing)
People visit the Xingcheng ancient city in northeast China's Liaoning Province Feb. 20, 2019. Built in the 15th century, the ancient city wall of Xingcheng is one of the five best preserved in China. (Xinhua/Yang Qing)