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只要功夫深，铁杵磨成针 |
zhǐ yào gōng fu shēn , tiě chǔ mó chéng zhēn |
If you work at it hard enough, you can grind an iron bar into a needle. / cf idiom 磨杵成針|磨杵成针, to grind an iron bar down to a fine needle (idiom); fig. to persevere in a difficult task / to study diligently |