Orion arm

例句：

1. 1. The Orion arm is a fascinating object in the night sky.
   猎户座臂是夜空中一个令人着迷的天体。
2. 2. The Orion arm nebula is a famous star cluster.
   猎户座臂星云是一个著名的星团。
3. 3. The Orion arm is known for its bright stars and beautiful constellations.
   猎户座臂以其明亮的星星和美丽的星座而闻名。