tunnelling machine
隧道掘进机
tunnelling construction
隧道施工
underground tunnel excavation
地下隧道开挖
tunnel boring
隧道掘进
subway tunneling project
地铁隧道工程
tunnel reinforcement
隧道加固
deep tunnel excavation
深层隧道开挖
preliminary contracts were let and tunnelling work started.
初步的承包合同已经签好，隧道已经开挖。
tunnelling machine
隧道掘进机
tunnelling construction
隧道施工
underground tunnel excavation
地下隧道开挖
tunnel boring
隧道掘进
subway tunneling project
地铁隧道工程
tunnel reinforcement
隧道加固
deep tunnel excavation
深层隧道开挖
preliminary contracts were let and tunnelling work started.
初步的承包合同已经签好，隧道已经开挖。
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