Taivo A Taiwan Mandarin dictionary

刻苦鑽研

kèkǔzuānyán

ㄎㄜˋ ㄎㄨˇ ㄗㄨㄢ ㄧㄢˊ

Simplified 刻苦钻研

  1. 1to study diligently

Keep 刻苦鑽研 and it comes back until you know it.

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