“North American Nebula”的概念、定义、翻译、参考文献-科学参考

单词	North American Nebula
释义	North American Nebula [`nȯrth ǝ`mer·i·kǝn `neb·yǝ·lǝ] ^ASTRONOMY A cloud of dust and gas in the constellation Cygnus; the density of this gas and dust is possibly a thousand times greater than the average density of interstellar gas; a much denser cloud of dust between the nebula and earth obscures portions of the emission nebula to create the appearance of the ``Gulf of Mexico'' and the ``Atlantic Ocean.''
随便看	odd parity check odd permutation odd-pinnate odds ratio odd term Odessey protractor Odiniidae odinite Odobenidae odograph odometer O'Donahue's theory Odonata odontalgia odontectomy odontexesis odontoblast odontoblastoma Odontoceti odontoclast odont-, odonto- odontogenesis odontogenic odontogenic cyst odontogenic fibroma

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