（中国有句俗话 人不可貌相 海水不可斗量 ） 英语怎么说

You cannot judge a book by its covers.
意思是你不能靠书皮来断定一本书的好坏，是英文版的人不可貌相。

Judge not from appearances.
人不可貌相，海不可斗量。

Men cannot be judged by their looks

You can't judge a book by it's cover