?明洞
明洞 (open cut tunnel) 指的是用明挖法修建的隧道。常用于地质不良路段 或埋深较浅的隧道。
路堑式明洞
明洞 ; 露天坑道
拱形明洞
Transport Secretary Philip Hammond cut the ribbon to officially open the road tunnel, which has taken four and a half years to build.
BBC: Hindhead Tunnel
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