“emission nebula”的概念、定义、翻译、参考文献-科学参考

单词	emission nebula
释义	emission nebula [i`mish·ǝn `neb·yǝ·lǝ] ^ASTRONOMY A type of bright diffuse nebula whose luminosity results from the excitation and ionization of its gas atoms by ultraviolet radiation from a nearby O- or B-type star.
随便看	ursolic acid urstromthal Urticaceae Urticales urticaria Urysohn lemma Urysohn theorem usable usable iron ore usable life usable rate of fire U Sagittae use-dilution test user user-defined function user-defined type user exit user friendly user group user interface user mode user program user-programmable memory user-to-user service user-written code

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