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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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Open the tool →三折其肱 (sān zhé qí gōng) is a Chinese idiom (chengyu) meaning “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”.
三折其肱 is pronounced sān zhé qí gōng in Mandarin Chinese.
Literally, 三折其肱 means “Three times breaking one's upper arm”. It is used to mean “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”.
三折其肱 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
肱:手臂。几次断臂,就能懂得医治断臂的方法。后比喻对某事阅历多,自能造诣精深