话说以前，宇宙中有一个太阳系，里面有九大行星围绕着太阳转动。

A long time ago, there was a solar system in the universe, inside there were the nine planets that orbit the sun.

youdao

话说以前，宇宙中有一个太阳系，里面有九大行星围绕着太阳转动。

A long time ago, there was a solar system in the universe, inside there were the nine planets that orbit the sun.

youdao