early-type nebula

例句：

1. 1. Early-type nebulae are often associated with supernovae explosions.
   早期型星云通常与超新星爆炸相关联。
2. 2. The discovery of a new early-type nebula in the constellation Orion has excited scientists.
   在猎户座中发现了一个新的早期型星云，激发了科学家的兴趣。
3. 3. The study of early-type nebulae is crucial for understanding the formation and evolution of galaxies.
   研究早期型星云对于理解星系的形成和演化至关重要。