Xiao Xuwen, a chief expert of China State Construction Group presentation China technical potential. For Hong Kong region students.
China developed tunnel boring machine "Jinghua" diameter of more than 16 meters.\
http://www.china.org.cn/arts/2021-10/26/content_77832258.htm
cover tunnel photo by: Matt Brown from London, England / CC BY
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http://www.china.org.cn/arts/2021-10/26/content_77832258.htm
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