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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	ironman ironmonger ironmongeries ironmongery iron oxide iron pyrite iron pyrites irons ironside ironsides ironsmith ironstone ironware ironweed ironwoman ironwood ironwork ironworker ironworks ironworks irony Iroquoian Iroquoians Iroquois irradiant

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