VHF omnirange, denoting a type of navigation system using a series of radio beacons.
Visual omnirange, denoting a type of navigation system using a series of radio beacons.
英语词典包含464360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。