modulus of ray class group

例句：

1. 1.The ray class group is responsible forthe transmission of light through the atmosphere.
   射线类群负责通过大气层传播光。
2. 2.The ray class group plays a crucialrole in the formation of galaxies.
   射线类群在星系形成中起着至关重要的作用。
3. 3. The ray class group isa fundamental part of the solar system.
   射线类群是太阳系的基本组成部分。