
Photo taken on Oct. 14, 2015 shows the east end of Dadu Mountain tunnel in Guanling Buyi and Miao Autonomous County, southwest China's Guizhou Province, Oct. 14, 2015. Stretching through the complicated karst terrain, the 11.82-kilometre tunnel, a part of the new high-speed railway connecting Shanghai and southwest China's Kunming, was drilled through on Thursday after five years' construction. (Xinhua/Liu Xu)
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