twin ring structures

例句：

1. 1. The twin ring structures of the moon are believed to be responsible for its lunar phases.
   月球的双环结构被认为是造成其月相变化的原因。
2. 2. The twin ring structures of the galaxy allow us to study the formation and evolution of galaxies.
   星系的双环结构使我们能够研究星系的形成和演化。
3. 3. The twin ring structures of the planet's surface can provide clues about its geological history.
   行星表面的双环结构可以提供有关其地质历史的信息。