Construction of various urban underground engineering, deep-buried tube work, large span highway (railway) tunnel are greatly improving tunnel construction technology.
一系列的城市地下工程、深埋管道工程、大跨度公(铁)路隧道的修建，大大促进了隧道施工技术的进步。
Construction of various urban underground engineering, deep-buried tube work, large span highway (railway) tunnel are greatly improving tunnel construction technology.
一系列的城市地下工程、深埋管道工程、大跨度公(铁)路隧道的修建，大大促进了隧道施工技术的进步。
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