又想当婊子又想立牌坊
yòu xiǎng dāng biǎo zi yòu xiǎng lì pái fāng
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1 lit. to lead the life of a whore but still want a monument put up to one's chastity (idiom)
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2 fig. to have bad intentions but still want a good reputation
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3 to want to have one's cake and eat it too