There are between a hundred and two hundred billion galaxies, with each galaxy having an average of over one billion stars.

 
  • 你知道宇宙中有多少星河嗎?一百億到兩百億個(gè)。
今日熱詞
目錄 附錄 查詞歷史
国内精品美女A∨在线播放xuan