tunnelling machine
隧道掘進機
tunnelling construction
隧道施工
underground tunnel excavation
地下隧道開挖
tunnel boring
隧道掘進
subway tunneling project
地鐵隧道工程
tunnel reinforcement
隧道加固
deep tunnel excavation
深層隧道開挖
preliminary contracts were let and tunnelling work started.
初步的承包合同已經簽好，隧道已經開挖。
tunnelling machine
隧道掘進機
tunnelling construction
隧道施工
underground tunnel excavation
地下隧道開挖
tunnel boring
隧道掘進
subway tunneling project
地鐵隧道工程
tunnel reinforcement
隧道加固
deep tunnel excavation
深層隧道開挖
preliminary contracts were let and tunnelling work started.
初步的承包合同已經簽好，隧道已經開挖。
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