1. An instrument for describing ellipses. 
   椭圆规一种画椭圆的仪器
2. a surface whose plane sections are all ellipses or circles. 
   截面都是椭圆或圆的表面。
3. A geometric surface, all of whose plane sections are either ellipses or circles. 
   椭球，椭面其所有切面都是椭圆或圆一种几何面
4. Either of two quadric surfaces generated by rotating a hyperbola about either of its main axes and having a finite center with certain plane sections that are hyperbolas and others that are ellipses or circles. 
   双曲面两个二次曲面的任何一个，通过使一个双曲线绕其任何一根中轴旋转而成，而且旋转时有一个有一定双曲线平面切面的中心，而其他切面是椭圆或圆周

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