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Meaning of 磨穿铁砚

Lookup via: Pinyin | Radicals
磨 mó 穿 chuān 铁 tiě 砚 yàn (Trad.: 磨穿鐵硯)
to grind one's way through an ink stone; to persevere in a difficult task (idiom); to study diligently (idiom)