observation balloon
短语词组
- observation balloon detail 观察气球
- air observation balloon 探空气球
- air r observation balloon 探空气球
- unmanned observation balloon [气象][航]无人观测气球
- an observation balloon 观测气球
- the release of observation balloon 释放观测气球
- balloon observation 气球观测
- pilot balloon observation 测风气球观测
- pilot t balloon observation 测风气球观测 返回 observation balloon