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The Zhangjiaping Tunnel, a control project of Yunnan’s Qiao-Da Highway, successfully excavated
Zhangjiaping Tunnel 1921 metre a control project of Yunnan’s Qiao-Da Highway successfully excavated.
Xinhuan news with photographs
http://big5.xinhuanet.com/gate/big5/www.yn.xinhuanet.com/newscenter/2020-09/05/c_139344593.htm
cover tunnel photo by: Matt Brown from London, England / CC BY
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