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词汇	planetary nebula
释义	planetary nebulan.（名词）planetary nebulathe Cat's Eye nebulaNGC 6543 A nebula, such as the Ring Nebula, consisting of a hot, blue-white, central star surrounded by an envelope of expanding gas.行星状星云：由一颗炽热的、蓝白色的中心恒星和包围它的一层向外膨胀的气体组成的星云，如环状星云
随便看	vertebral canal vertebral column vertebrals vertebras vertebrate vertebrated vertebrates vertebrating vertebration vertebrations verted vertex vertexes vertical vertical vertical angle vertical circle vertical file verticals vertical union vertices vertices verticil verticillaster verticillasters

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