rén bù kě mào xiàng
you can't judge a person by appearance (idiom)
you can't judge a book by its cover
often in combination 人不可貌相，海水不可斗量[ren2 bu4 ke3 mao4 xiang4 , hai3 shui3 bu4 ke3 dou3 liang2]
rén bù kě mào xiàng , hǎi shuǐ bù kě dǒu liàng
You can't judge a person by appearance, just as you can't measure the sea with a pint pot. (idiom)
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