人不可貌相 [ㄖㄣˊ ㄅㄨˋ ㄎㄜˇ ㄇㄠˋ ㄒㄧㄤˋ; ren2 bu4 ke3 mao4 xiang4]
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[ㄖㄣˊ ㄅㄨˋ ㄎㄜˇ ㄇㄠˋ ㄒㄧㄤˋ ㄏㄞˇ ㄕㄨㄟˇ ㄅㄨˋ ㄎㄜˇ ㄉㄡˇ ㄌㄧㄤˋ; ren2 bu4 ke3 mao4 xiang4 hai3 shui3 bu4 ke3 dou3 liang4]
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