lighter-than-air aircraft
... lift force 升力(代号) lighter-than-air aircraft 轻于空气的航空器(代号) Maruzen-Kaiun 〈日本〉丸善海运公司(代号) ...
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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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