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During the Spring and Autumn period, two powerful clans, Fan and Zhonghang, within the Jin state were preparing to revolt against Duke Ding of Jin. Many people believed that Duke Ding would be defeated once more.
However, some argued that the Fan clan's uprising was an act of rebellion and would not garner popular support. Moreover, they reasoned that Duke Ding, having suffered numerous defeats, ought to have learned from his past experiences. Just as the proverb 'San Zhe Gong Wei Liang Yi' suggests – one who has mended his broken arm thrice becomes a good doctor – if he properly reflected on his past lessons, he would not fail this time.

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Open the tool →三折肱为良医 (sān zhé gōng wéi liáng yī) is a Chinese idiom (chengyu) meaning “Through repeated personal experiences, especially with difficulties or setbacks, one gains profound knowledge and becomes highly skilled or an expert in a particular field; extensive experience makes one an expert”.
三折肱为良医 is pronounced sān zhé gōng wéi liáng yī in Mandarin Chinese.
Literally, 三折肱为良医 means “Three broken arms make a good doctor”. It is used to mean “Through repeated personal experiences, especially with difficulties or setbacks, one gains profound knowledge and becomes highly skilled or an expert in a particular field; extensive experience makes one an expert”.
三折肱为良医 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
几次断臂,就能懂得医治断臂的方法。后比喻对某事阅历多,富有经验,自能造诣精深。