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维基
百科
气体星云
gaseous nebula
- 元素氢占气体星云物质的百分之九十。
The element hydrogen comprises 90 % of the matter in gaseous nebulae. - 行星状星云是一类孤立的气体星云，具有相当程度的双侧对称性。
Planetary nebulae are a type of isolated gaseous nebulae possessing a fair degree of bilateral symmetry. - 他们记录了行星形成前，太阳系的历史，并且是第一个围绕我们原太阳的固体凝结的气体星云。
'They recorded the history of the solar system before any of the planets formed, and were the first solids to condense out of the gaseous nebula surrounding our protosun.'
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