類星體extragalacticmatter: 河外物質(zhì)extragalactic γ-ray flux: 河外星系extragalacticnova: 河外新星extragalactic system: 河外星系extragalacticobject: 河外天體下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯
