(航空学)其外形由坚固的、龙骨状的结构以及内部气压两者同时支撑。
(aeronautics) having a form maintained by a rigid keel-like structure as well as by internal gas pressure.
平胸鸟的与一种平胸，没有一般飞翔性鸟类所特有的龙骨状突起的不会飞的鸟有关的；
Relating to or being any of a group of flightless birds having a flat breastbone without the keellike prominence characteristic of most flying birds.
铝制船舶上的腐蚀的通常形式是船体钢板、船舵、船底龙骨上的局部点状腐蚀，特别是在焊缝方面。
Corrosion on Aluminum vessels is also generally in the form of localized pitting to the hull plate, rudders, bilge keels and particularly in way of weld seams.
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