
Tourists visit the Datong Coal Museum, which is located underground at the Jinhuagong National Mine Park in Datong City, north China's Shanxi Province, May 16, 2017. (Xinhua/Cao Yang)
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Tourists visit the Datong Coal Museum, which is located underground at the Jinhuagong National Mine Park in Datong City, north China's Shanxi Province, May 16, 2017. (Xinhua/Cao Yang)