... 寒武纪生命大爆发 the Cambrian explosion 河外星云 extragalactic nebula 恒星 star ...
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elliptical extragalactic nebula [天] 椭圆河外星云
·2,447,543篇论文数据，部分数据来源于NoteExpress
N → the former name for galaxy
Extragalactic nebula is invisible to the naked eye.
我们用肉眼是看不到河外星系的。
youdao
"Extragalactic nebula" is a former name for "galaxy".
“外星云”是“星系”的曾用名。
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