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Gansu's Dongshan tunnel at average altitude of 3,850 meters drilled through

    Chu Yang
    By Chu Yang Replies (1)

    Gansu's Dongshan tunnel at average altitude of 3,850 meters drilled through

    http://english.www.gov.cn/news/photos/202103/03/content_WS603ede96c6d0719374af9d85.html

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