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 隧道洞口設施equipment of tunnel portal 隧道洞口設施tunnel portal section 東津水電站wing wall tunnel portal 翼墻式洞門;詳細翻譯tunnel portal frame 洞門框bench tunnel portal 臺階式洞門tunnel portal area 隧道入口范圍 返回 tunnel portal