beunable either to advance or to retreat ❍ 迫使希特勒顿兵于高山与坚城之下，～，损失甚大，陷于僵局。(《毛泽东选集》842) Hitler has been forced to halt his troops before high mountains and outside an impregnable city,unable to advance and unable to retreat,suf fering immense losses and getting into an impasse.