if you say that two people are joined at the hip, you mean that they are very friendly with each other and spend more time together than is usual.
I can go to London without Mike. We're not joined at the hip, you know.
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。