| 单词 | ring nebula |
| 释义 | Definition of ring nebula in English:ring nebulanoun Astronomy
OriginMid 19th century; earliest use found in James Joseph Sylvester (1814–1897), mathematician. Definition of ring nebula in US English:ring nebulanoun Astronomy
OriginMid 19th century; earliest use found in James Joseph Sylvester (1814–1897), mathematician. |
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