单词 | planetary nebula |
释义 | planetary nebula planetary nebula n.(名词)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 |
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