勤奋刻苦

diligent / assiduous

diligent / industrious / hardworking / frequent / regular / constant

variant of 勤[qin2] / industrious / solicitous

hardworking / diligent

to exert oneself (bound form)

quarter (hour) / moment / to carve / to engrave / to cut / oppressive / classifier for short time intervals

hardworking / assiduous

bitter / hardship / pain / to suffer / to bring suffering to / painstakingly