Quadrafos

例句：

1. 1.The quadrilateral is a shape with four sides.
   这个四边形是一个有四条边的图形。
2. 2.The quadrilateral is used to describe the shape of a square or rectangle.
   这个四边形用来描述正方形或矩形的形状。
3. 3. The quadrilateral was formed by folding two sheets of paper together.
   这个四边形是由将两张纸折叠在一起形成的。