emission-line star

例句：

1. 1. The emission line star in the sky is a rare sight to behold.
   天空中的发射线星是一种罕见的景观。
2. 2.The star's emission line was detected at a distance of 30 light years.
   这颗星的发射线在30光年的距离上被检测到。
3. 3.The study of emission lines in stars has led to new insights into the formation of galaxies.
   对恒星中发射线的研究表明，这对形成星系的新见解。