参考词典中extragalactic nebula的常规释义：
基本释义
英英解释
- (astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust
[同]
extragalactic nebula, galaxy
[例]
- extragalactic nebula' is a former name for galaxy'
点击查看……
鲁公网安备 37060202000128号 
