... 曲线隧道 curved tunnel 明洞 open tunnel;opencut tunnel;tunnel without cover;gallery 隧道勘测 tunnel survey ...
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Open doors to tunnel 打开隧道大门 ; 打开地道大门
open jet wind tunnel 开口式风洞
open-cut tunnel 露天坑道
cut-type open cut tunnel 路堑式明洞
open-circuit tunnel 开式风洞
arch open cut tunnel 拱形明洞
open-jet tunnel 测试段开口式风洞
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