刻苦学习

to study hard / assiduous

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

to learn / to study / to imitate / science / -ology

to learn / to study

surname Xi

(bound form) to practice / to study / habit / custom