trapezoid [bone]

例句：

1. 1. The trapezoid is a shape with two parallelsides and one rectangular side.
   梯形是一种具有两条平行边和一条矩形边的图形。
2. 2. The trapezoid has four equalangles at its vertex.
   梯形在其顶点处有四个相等的角。
3. 3. In mathematics, the trapezoid isused to represent a series of points connectedby straight lines.
   在数学中，梯形用于表示由直线连接的一系列点。