a small unmanned balloon sent up to show the direction and speed of the wind
| 单词 | pilot balloon |
| 释义 | pilot balloonnouna small unmanned balloon sent up to show the direction and speed of the wind |
| 随便看 |
英语词典包含66266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。