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刻苦钻研
刻苦鑽研
kèkǔzuānyán
1. to study diligently

Character Breakdown

刻
kè
to carve, to engrave; a quarter hour; a moment
HSK 3 8 丶
苦
kǔ
bitter; hardship, suffering
HSK 4 8 丶
钻
zuān
diamond; to bore, to drill, to pierce
HSK 6 10 丶
研
yán
to grind, to rub; to study, to research
HSK 4 9 丶

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Chinese