刻苦钻研 (刻苦鑽研) kèkǔzuānyán

kèkǔzuānyán set phrase to study diligently
Domain: Modern Chinese 现代汉语 , Subdomain: , Concept:
Notes: (CC-CEDICT '刻苦鑽研')

Word is mentioned most frequently in

Truncated for common words