Cartesian oval

例句：

1. 1. The Cartesianoval is a mathematical concept that describesthe shape of a circle.
   卡泰西安椭圆是描述圆形状的数学概念。
2. 2. In mathematics, the Cartesian oval is used to representthe area of a square.
   在数学中，卡泰西安椭圆用来表示正方形的面积。
3. 3. The Cartesian oval is often used in geometry todefine the boundaries of a plane figure.
   卡泰西安椭圆在几何学中常用来定义平面图形的边界。