刻苦钻研 kèkǔzuānyán study diligently Definitions Defs Origin Strokes Stroke Words Sentences Sents 刻苦钻研 (刻苦鑽研) kèkǔzuānyán study diligently to study and research with great effort; to delve into Sources Definitions CC-CEDICT
刻苦钻研 (刻苦鑽研) kèkǔzuānyán study diligently to study and research with great effort; to delve into Sources Definitions CC-CEDICT
