磨炼

see 磨練|磨练[mo2 lian4]

to rub / to grind / to polish / to sharpen / to wear down / to die out / to waste time / to pester / to insist

grindstone / to grind / to turn round

to refine / to smelt

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