vacuum balloon的意思|示意

美 / / 英 / /

真空气球

vacuum balloon相关短语

vacuum balloon相关例句

Compared with balloons using hot air or gas of which the mass is lower than that of air to produce the buoyancy, the vacuum balloon is convenient to operate.

比较使用热空气或使用低于空气质量的气体产生浮力的气球，操作方便。