“Sword of Orion”的概念、定义、翻译、参考文献-科学参考

单词	Sword of Orion
释义	Sword of Orion Astronomy A region of sky around the Orion Nebula. As well as the Orion Nebula and the stars within it, the Sword of Orion includes the open cluster NGC 1981, the diffuse nebula NGC 1977, and the double star Iota Orionis.
随便看	principle of excluded fourth principle of excluded middle principle of excluded third principle of explosion principle of included fragments principle of indifference principle of individuation principle of insufficient reason principle of least action principle of least privilege principle of mathematical induction principle of moments principle of non-contradiction principle of non-triviality principle of parsimony principle of plenitude principle of sufficient reason principle of superposition principle of the excluded middle principle of uniformitarianism principle of utility principle of verifiability principle stress axes Pringsheim, Nathanael printed circuit

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