galactic cloud

例句：

1. 1. The galacticcloud is a fascinating object that scientists studyfor clues about the universe.
   银河云是一个令人着迷的天体，科学家们研究它以寻找关于宇宙的线索。
2. 2.The galactic cloud is a mysterious phenomenonthat has puzzled astronomersfor centuries.
   银河云是一个神秘的现象，几个世纪以来一直困扰着天文学家。
3. 3. Thegalactic cloud is a vast collection ofgas and dust that forms stars and planets.
   银河云是大量气体和尘埃的集合，这些物质形成了恒星和行星。