艱苦卓絕（艱苦卓絶）　

◎ 艱苦卓絕 jiānkǔ-zhuōjué

[showing the utmost fortitude;be extremely hard and bitter;be most ardnous amid untold difficulties;with surpassing bravery] 形容十分艱苦,極不平凡

艱苦卓絕的斗爭