The surface of the sun is a glowing gas envelope.

太阳的表面是一层炽热的气体层。

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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。

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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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But the consequence is that any planets that happen to be orbiting relatively close to the star will likely be engulfed in its expanding envelope of gas.

BBC: Newly found planets are 'roasted remains'

Dr Marcy suspects that his new discovery, which has about 45 times the mass of the Earth, is composed of a rocky core surrounded by a thick envelope of hydrogen and helium gas.

ECONOMIST: Extrasolar planets