磨ㄇㄛˊ穿ㄔㄨㄢ鐵ㄊㄧㄝˇ硯ㄧㄢˋmóchuān‑tiěyàn

简磨穿铁砚

  1. 形容持續不懈，刻苦鑽研學問。例 「寒窗苦讀，磨穿鐵硯」。

英to grind one's way through an ink stone, to persevere in a difficult task (idiom)​, to study diligently (idiom)​