elliptic waveguide

例句：

1. 1.The elliptical shape of the planet is due to its rotation around its axis.
   行星的椭圆形状是由于它绕其轴旋转造成的。
2. 2. The elliptical orbit of the moon around the earth is well-known.
   月亮围绕地球的椭圆轨道是众所周知的。
3. 3. The elliptical galaxy is a spherical object with a curved edge.
   椭圆星系是一个球体，边缘呈曲线状。