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Yanjiazhai tunnel of Guiyang-Nanning high-speed railway drilled through

Updated: Jun 22, 2021 chinadaily.com.cn Print
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Tunnel drilling machines work inside the Yanjiazhai tunnel of the Guiyang-Nanning high-speed railway in Dushan county, Southwest China's Guizhou province, June 14, 2021. [Photo/Xinhua]
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