To become an expert through repeated experiences and setbacks, learning from one's own mistakes or misfortunes; to gain profound knowledge or skill through practical experience.
他从事这个行业几十年，深知其中奥秘，真是三折其肱，经验丰富啊。
He has worked in this industry for decades, deeply understanding its intricacies; truly, he has become an expert through repeated experiences and is rich in knowledge.
Era:
Ancient
Frequency:
Synonym:
Story:
During the Spring and Autumn period, the Fan and Zhonghang clans within the Jin state were preparing to rebel against Duke Ding of Jin. Many believed that Duke Ding would fail again.
However, some argued that the Fan clan's rebellion was an act of treason and would not gain popular support. Moreover, Duke Ding had suffered repeated defeats, but if he properly summarized his experiences, just as one becomes a good doctor after breaking one's arm three times, he would not necessarily fail.
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