spherical nebula

例句：

1. 1. The starry sky is dotted with spherical nebulae.
   星星点缀着球状星云。
2. 2.The discovery of a new type of spherical nebula has excited the scientific community.
   发现了一种新型的球状星云，激发了科学界的兴趣。
3. 3.In the study of astronomy, the spherical nebula is an important subject to explore.
   在天文学研究中，球状星云是一个重要课题需要探索。