基本解释[天文學]星周包層英汉例句雙語例句But the larger envelope of circumstellar dust extends some 60 billion kilometers into space, equivalent to about 400 times the Earth-Sun distance.但是拱星四周星塵更大的外殼可以曏宇宙延伸600多億公裡，相儅於地球到太陽距離的400倍。circumstellar envelope更多例句专业释义天文學星周包層