单词	extragalactic
释义	extragalactic /ˌɛkstrəɡəˈlaktɪk / adjective Astronomy Situated, occurring, or originating outside the Milky Way galaxy: extragalactic radio sources... Hence the whole foundation of extragalactic astronomy and Big Bang theory is swept away’. It is definitely an extragalactic background. The number of these sources is consistent with the expected number of extragalactic sources in the background sky.
随便看	propagation constant propagative propagator propagatory propagatrix propage propagular propagule propagulum propaideia propalation propalinal propamidine propanal propane propanediol propanidid propanoic acid propanol propanone propantheline pro-parent propargyl propargyl alcohol propargylamine

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