回答

・an insurmountable wall
・a wall difficult to overcome

例句
I would like to say to my friend at cafe, "There is an insurmountable wall between Ms. A and me."
我想對咖啡館裡的朋友說：「我和○○有無法跨越的牆。」

順便說一句，這裡的「牆」代表「障礙物」，所以你也可以用

”a barrier " 或"a stone wall" 來表示

克服也可以表示為
"survive "、"get through"、 "surmount "。

有幫助｜0