短語詞組短語tunnel branch portal in sandy 隧洞掛口orthonormal tunnel portal 正洞門facilities of tunnel portal 隧道洞口設(shè)施equipment of tunnel portal 隧道洞口設(shè)施tunnel portal section 東津水電站wing wall tunnel portal 翼牆式洞門;詳細(xì)繙譯tunnel portal frame 洞門框bench tunnel portal 臺(tái)堦式洞門tunnel portal area 隧道入口範(fàn)圍 返回 tunnel portal