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Literally: If you don't read for three days, you will become unattractive.
三日不读书，面目可憎 (simplified, Pinyin sān rì bù dúshū, miànmùkězēng, traditional 三日不讀書，面目可憎)
- If you are not diligent in your studies, you will remain ignorant, and nobody will be attracted to you.
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