dark galactic nebula

• 暗银河星云,银河暗星云

dark galactic nebula的用法和样例：

例句

1. Galactic nebulas are masses of diffuse material within our galaxy.
   银河星云是我们星系中的一团团弥散物。
2. Some celestial bodies similar to galactic nebulas but without any luminosity sometimes reveal their presence as dark patches obscuring the light of stars beyond them.
   某些与银河星云相似但不发光的天体，有时看来象块黑色补丁，遮住了周围的星光。