Báijiǔ shì tōngguò zhēngliú gōngyì niàngzào ér chéng de.
Baijiu is produced through the process of distillation.
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蒸 means 'to steam' and 馏 means 'to distill.' Together they describe the process: heating a liquid until it evaporates (steams), then condensing the vapor back into liquid.