annular ring

例句：

1. 1. The annular ring of the planet is visible from space.
   行星的环形圈在太空中可见。
2. 2.The annular ring of the moon is very thin.
   月球的环形圈非常薄。
3. 3.The annular ring of the sun is made up of a series of concentric circles.
   太阳的环形圈由一系列同心圆组成。