DICT.TW Dictionary Taiwan

 磨杵成針 [ㄇㄛˊ ㄔㄨˇ ㄔㄥˊ ㄓㄣ; mo2 chu3 cheng2 zhen1]
 to grind an iron bar down to a fine needle (idiom); fig. to persevere in a difficult task
 to study diligently
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