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Tourists view the Zhaozhou Bridge, the oldest standing stone-arched bridge in China, across the Xiaohe River in Zhaoxian County, north China's Hebei Province, April 5, 2019. (Xinhua/Liang Zidong)

Tourists view the Zhaozhou Bridge, the oldest standing stone-arched bridge in China, across the Xiaohe River in Zhaoxian County, north China's Hebei Province, April 5, 2019. (Xinhua/Liang Zidong)