wheels within wheels used to indicate that a situation is complicated and affected by secret or indirect influences.
☞ The image here is of the cogs found in pieces of intricate machinery.
英语词组固定搭配大全包含15956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。