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柯林斯高阶英汉双解学习词典释义
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英英词典释义
  • Noun
    1. a splendid assemblage (especially of famous people)
    2. tufted evergreen perennial herb having spikes of tiny white flowers and glossy green round to heart-shaped leaves that become coppery to maroon or purplish in fall
    3. (astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust;
    "`extragalactic nebula' is a former name for `galaxy'"
行业词典
  • 天文学: 星系;通常由几亿至上万亿颗恒星以及星际物质构成、空间尺度为几千至几十万光年的天体系统。;
    物理学: 星系;