飞船驾驶员，气球驾驶员轻于空气的航空器，例如气球的驾驶员或导航员。
A pilot or navigator of a lighter - than - air craft, such as a balloon.
就轻于空气的民用航空器而言，飞行中是指自其离开地面时起至其重新着地时止。
In the case of a civil aircraft lighter than air, the expression in flight relates to the period from the moment when it becomes detached from the surface until it becomes again attached thereto.
气球：一种大型气密球囊，内充热空气或轻于空气的气体（如氦或氢），以产生浮力，可在大气中上升和飘浮。
Balloon: Large airtight bag filled with hot air or a lighter-than-air gas such as helium or hydrogen that can rise and float in the atmosphere.
相对于我们熟知的球形或者雪茄形的内部充满轻于空气的高空气球，Skylifter开发的是一个铁饼状的。
Rather than use either a spherical or a cigar-shaped aerostat, as the gas-filled envelope of a lighter-than-air craft is known, Skylifter has developed a discus-shaped one.
无人驾驶自由气球，是指无动力驱动、无人操纵、轻于空气、总质量大于4千克自由漂移的充气物体。
An unmanned free balloon shall refer to a freely drifting inflatable object which is driven with no power, is piloted by nobody, is lighter than air, and whose gross mass is more than 4 kilograms.
无人驾驶自由气球，是指无动力驱动、无人操纵、轻于空气、总质量大于4千克自由漂移的充气物体。
An unmanned free balloon shall refer to a freely drifting inflatable object which is driven with no power, is piloted by nobody, is lighter than air, and whose gross mass is more than 4 kilograms.
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