刻苦钻研 Traditional 刻苦鑽研 kè kǔ zuān yán 🔊 to study diligently + Keep this word Meanings kè kǔ zuān yán 刻苦鑽研 to study diligently Its characters 刻kèquarter (hour)HSK 3苦kǔbitterHSK 4钻zuānto drillHSK 6研yánto grind