单词	fifth column
释义	fifth columnˌfifth ˈcolumn noun [countable] a group of people who work secretly to help the enemies of the country where they live or the organization in which they work—fifth columnist noun [countable]
随便看	3-D printer 3-D printing 3G 4 401K 404 411 419 scam .45 4-D film 4-F 4G 4-H 4WD 4x4 527 $64,000 question 737 747 7/7 7-Eleven 7-Up 8 800 number 911

英语词典包含52748条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。