彗星象行星一样绕太阳运转，然而其轨道呈狭长的椭圆形。

Comets move around the sun like planets, but in long oval course.

youdao

彗星象行星一样绕太阳运转，然而其轨道呈狭长的椭圆形。

Comets move around the sun like planets, but in long oval course.

youdao