“planetary nebula”的概念、定义、翻译、参考文献-科学参考

单词	planetary nebula
释义	planetary nebula [`plan·ǝ´ter·ē `neb·yǝ·lǝ] ^ASTRONOMY An oval or round nebula of expanding concentric rings of gas associated with a hot central star.
随便看	command language command level command list command mode command module command net command processor command pulses command set command shell Commelinaceae Commelinales Commelinidae commensal commensalism commensurable motions commensurate orbits comment comment code comment out commercial diesel cycle commercial harbor commercial lecithin commercial mine commercial ore

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