elliptical stair

例句：

1. 1. The elliptical orbit of the planets is fascinating.
   行星的椭圆轨道令人着迷。
2. 2. The elliptical shape of the galaxy is a testament to its age.
   银河系的椭圆形状是其年龄的一个证明。
3. 3. The elliptical motion of the stars in the night sky creates a mesmerizing effect.
   夜空中星星的椭圆运动创造了一种迷人的效果。