air balloon

n.

气球；

Air balloon
Air balloon
Air balloon
Balloons over Waikato
Warren County Farmers' Fair Balloon Festival
DESIGN OF TEMPERATURE AND HUMIDITY AIR MONITORING SYSTEM USING WIRELESS MEDIA ON THE AIR BALLOON
Hot-air balloon as a platform for boundary layer profile measurements during particle formation
Introducing the concept of epistemological beliefs into medical education: the hot-air-balloon metaphor.
Epidemiology of hot-air balloon crashes in the U.S., 1984-88.
Factors associated with fatalities and injuries from hot-air balloon crashes
Wind-based navigation of a hot-air balloon on Titan: a feasibility study
Rare electrocution due to powerline contact in a hot-air balloon: comparison with fatalities from blunt trauma.
Hot-air Balloon Measurements of Vertical Variation of Boundary Layer New Particle Formation