九折臂

Explanation: Nine: refers several times; off: off. Repeatedly broken arm, after repeated treatment known to medical knowledge. Metaphor of experience and more experience. 　　Source: Chu Chu Yuan, "IX Xi chanting (chanting that Min Xi Xi)": "Jiu Zhe Xi arm from doctors, I ran so far known by the letter." Wang Yi Note: "countryman Jiuzhe arm, More calendar recipes, then into the Good Doctor. "