常見例句

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向宇宙延伸600多億公里，相當(dāng)于地球到太陽距離的400倍。
返回 circumstellar envelope