人ㄖㄣˊrén不ㄅㄨˋ可ㄎㄜˇbùkě貌ㄇㄠˋ相ㄒㄧㄤˋmàoxiàng，海ㄏㄞˇ水ㄕㄨㄟˇhǎishuǐ不ㄅㄨˋ可ㄎㄜˇbùkě斗ㄉㄡˇ量ㄌㄧㄤˊdǒuliáng

  1. 〈諺〉人的好壞優劣不可單憑外貌評判，如同海水不可用斗來測量一般。比喻不可以貌取人。例 「看他身形瘦弱，沒想到竟是跆拳道高手，真是人不可貌相，海水不可斗量」。

英you can't judge a person by appearance, just as you can't measure the sea with a pint pot (idiom)​