luminous galactic nebula的用法和樣例：
例句
- Galactic nebulas are masses of diffuse material within our galaxy.
銀河星雲是我們星系中的一團團彌散物。 - 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.
某些與銀河星雲相似但不發光的天體，有時看來象塊黑色補丁，遮住了周圍的星光。
