repair and utilize old or discarded things; repair old things and make use of waste materials
❍ 工人们～，为国家节省了一大笔钱。The workers repaired and utilized old things and save a large sum of money for the state.
修旧利废
repair and utilize old(or discarded)things
修旧利废xiū jiù lì fèi
把旧的修理好，变废物为有用的东西。repair and utilize old or discarded things, repair old things and make use of waste materials