千锤百炼

after hard work and numerous revisions (idiom) / the vicissitudes of life

thousand

see 鞦韆|秋千[qiu1 qian1]

hammer / to hammer into shape / weight (e.g. of a steelyard or balance) / to strike with a hammer

variant of 錘|锤[chui2]

hundred / numerous / all kinds of

to refine / to smelt

variant of 鏈|链[lian4], chain / variant of 煉|炼[lian4]