something that you say which means you cannot judge the quality or character of someone or something just by looking at them.
She doesn't look very intelligent, but you can't judge a book by its cover.
英语词组固定搭配大全包含18674条英汉双解词组，基本涵盖了全部常用英文词组、短语的翻译及用法，是英语学习的有利工具。