“D2 radio source”的概念、定义、翻译、参考文献-科学参考

单词	D2 radio source
释义	D2 radio source [¦dē¦tü `rād·ē·ō ´sȯrs] ^ASTRONOMY A radio source consisting of a small, variable nuclear component sometimes coincident with an optical object, and a second, larger component with a much steeper radio spectrum.
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