“Orion nebula”的概念、定义、翻译、参考文献-科学参考

单词	Orion nebula
释义	Orion nebula Encyclopedia 理学发射星云释 Orion nebula猎户座大星云位于猎户座的发射星云。用肉眼观察，猎户座中构成“宝剑”的有三颗星，中间一颗是较模糊的亮斑，它不是单颗星，而是一个星云，即猎户座大星云（星表编号为M42和NGC1976）。
随便看	underglaze decoration underglaze red undergoing professional training at an old-type opera school undergraduate education undergraduate education of pratacultural science Undergraduate Specialty Catalogue of Higher Education Institution Underground underground anchor rig underground antiseepage method Underground Architecture underground banks underground blasting underground breaking vehicle underground car loading equipment underground cavern excavation underground city in Northern America underground coal gasification underground cold storage facility underground communication underground complex underground concrete-gunite truck underground concrete-mixer truck underground cultural and educational facilities underground deep stormwater storage tunnel underground diaphragm wall

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