Read Edit View history 刻苦钻研 kèkǔzuānyán to study diligently Origin Definitions Defs Strokes Stroke Words Sentences Sents 刻苦钻研 刻苦鑽研 kèkǔzuānyán to study diligently To apply oneself with great effort and persistence to research or study
刻苦钻研 刻苦鑽研 kèkǔzuānyán to study diligently To apply oneself with great effort and persistence to research or study