inner envelope 内囊膜
Inner Cardboard Envelope 内纸板信封
Inner Whirlwind Non-instant Center Envelope 内旋风式无瞬心包络铣削
The inner envelope filled with helium in the head section of the blimp and the third built-in airbag at the tail is filled with ethane combustible gas.
飞船头部的内置气囊中充满了氦气，而置于尾部的第三节内置气囊则充满了乙烷可燃气体。
The inner envelope holds helium in the head section of the blimp and an ethane fuel gas in the three tail sections.
飞船头部的内置气囊中充满了氦气，而置于尾部的第三节内置气囊则充满了乙烷可燃气体。
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