百折不挠

Explanation: Fold: frustration; flexible: bending. Metaphor of a strong will, no matter how many times by _set_backs, wavering back. 　　Usage: Partial official; as predicate, attributive, adverbial; describe the strong-willed, persist in the end 　　Source: Han Yong "Joe Yuen Qiu monument": "China is still their sexual disease Park, there is perseverance, the Pro and can not seize a large section of the wind." 　　Examples: Hanyang Man Army commander Xing, Department of Changsha County, have always advocated revolution, repeated every time we fall, ~. (Caidong Fan, Xu hut Father "Romance of the Republic of the popular" third back) 　　Riddle: The more difficult the more forward Thesaurus:  constancy, Make light of Sway, hang on by the eyelashes, keep one's end up, persist in sth.