의미
- night and day (idiom); continuous strenuous effort
관련 어휘
HSK 7빈도 14,161부수 一기타
to be a little bit careless; to have a moment of inattentiveness
HSK 7빈도 21,385부수 一번체 一絲不苟동사
not one thread loose (idiom); strictly according to the rules
meticulous
not one hair out of place