高空气球 meaning in English
aero stat
aerostat
Examples
- The pentagon does not comment on ufos , except to say they do not exist and that such objects really are high altitude balloons or military aircraft
五角大楼除了说不明飞行物不存在、所谓的不明飞行物实际上是高空气球或军用飞机外，没有对不明飞行物作更多评论。