隧洞开挖
- n.tunneling operation
 - 网络tunnel excavation
 
隧洞开挖隧洞开挖
tunnel excavation
专业英语词汇水利水电工程... ... 隧洞渐变段 tunnel transition section 隧洞开挖 tunnel excavation 隧洞排水 tunnel drainage ... 
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        The study on controlled blasting in excavation of diversion runnels of the underground power plant on the right bank of Three Gorges project
