懂中文 Dong Chinese

焚膏继晷

fén​gāo​jì​guǐ

to burn the midnight oil ; to work continuously night and day

Definitions

焚膏继晷 (焚膏繼晷) 

fén​gāo​jì​guǐ

to burn the midnight oil (idiom); to work continuously night and day

Sources