千锤百炼

Explanation: Metaphor gone through a number of exercises and tests hard struggle. Also refers to the number of articles and works well changes. 　　Usage: Joint type; as predicate, attributive, adverbial; with compliment 　　Source: Tang Pi Rixiu "Liu Zaoqiang monument": "Forging the word hundred thousands of refining for the sentence, although not forced Zhu Bai, also was the best job." 　　Examples: Poets of the sentence is good for the warning, will be ~ then it can become. (Qing Zhao Yi "Oubei" Volume I)