ˇzhǐㄧㄠˋyàoㄍㄨㄥgōngㄈㄨㄕㄣshēnㄊㄧㄝˇtiěㄔㄨˇchǔㄇㄛˊㄔㄥˊchéngㄓㄣzhēn

  1. 諺語)​比喻只要有恆毅力下功夫事情成功通俗常言疏證··要功磨成通俗編》:思省驪山繡針。』俗語只要功夫深,鐵杵磨成針。』。」

If you work at it hard enough, you can grind an iron bar into a needle., cf idiom 磨杵成針, to grind an iron bar down to a fine needle (idiom)​; fig. to persevere in a difficult task, to study diligently