Taivo A Taiwan Mandarin dictionary

磨杵成針

móchǔchéngzhēn

ㄇㄛˊ ㄔㄨˇ ㄔㄥˊ ㄓㄣ

Simplified 磨杵成针

  1. 1to grind an iron bar down to a fine needle (idiom); fig. to persevere in a difficult task
  2. 2to study diligently

Keep 磨杵成針 and it comes back until you know it.

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