lighter-than-air-aircraft
lighter-than-air-aircraft 轻于空气航空器 light experimental helicopter (LHX) 轻型实验直升机 ..
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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.
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。
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