勤學苦練

to study diligently / to train assiduously

diligent / industrious / hardworking / frequent / regular / constant

variant of 勤[qin2] / industrious / solicitous

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

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

to train hard / to practice diligently / hard work / blood, sweat, and tears

to practice / to train / to drill / to perfect (one's skill) / exercise / (literary) white silk / to boil and scour raw silk