艰苦卓绝（艱苦卓絶）　

◎ 艰苦卓绝 jiānkǔ-zhuōjué

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

艰苦卓绝的斗争