one part of a large system or organization.
He was just a small cog in the large wheel of organised crime.
This warehouse is an important cog in our distribution machine.
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。