椭圆规

例句：

1. 1. The ellipse in the painting is very realistic.
   这幅画中的椭圆非常逼真。
2. 2. The ellipse of the planet is determined by its distance from the sun.
   行星的椭圆轨道是由它离太阳的距离决定的。
3. 3. The ellipse of the moon is a result of its orbit around the earth.
   月亮的椭圆轨道是其绕地球运行的结果。