Tā xiǎoshíhòu shì gè chǒuxiǎoyā, xiànzài biàn de hěn piàoliàng.
She was an ugly duckling as a child; now she's very beautiful.
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Hans Christian Andersen's 1843 Danish fairy tale is widely taught in Chinese primary schools. The phrase 丑小鸭变白天鹅 ('ugly duckling becomes a swan') is a common metaphor for glow-ups and Cinderella-style transformations.