
A tourist takes photos of a huge piece of coal displayed at 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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A tourist takes photos of a huge piece of coal displayed at 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)