[英译]:铁杵能磨成针,但木杵只能磨成牙签.

A steel stick to ground into a needle, but can only be ground into toothpicks a teethpick

中国人口头语的用法, 用的好也能够恬到好处的.

Iron bar can be ground into a needle, but can only be ground into a wooden toothpicks.

英语没有这个成语，最好别这样写。

a steel stick can be pollished into a needle while a wood stick can only be pollished into a teethpick.