短語詞組短語Impregnable force 金湯力;金impregnable pass 雄關(guān)Impregnable Fort 無堅不摧impregnable bulwark 堅不可摧的力量或防御物impregnable a 攻不破的impregnable E 征服不了的Solid Impregnable 固金湯Impregnable Fortress 鐵壁之砦;銅墻鐵壁;金城湯池的略語impregnable quadrilateral 堅不可摧的四邊形 返回 impregnable