化腐朽為神奇

huàfǔxiǔwéishénqí

turn the foul and rotten into the rare and ethereal

1) turn bad into good

2) change waste material into things of value

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化腐朽為神奇|化腐朽为神奇 [huà fǔ xiǔ wéi shén qí] ► lit. to change something rotten into something magical (idiom)