梯形管

例句：

1. 1. The trapezoid is a shape with four right angles.
   梯形是一个有四个直角的形状。
2. 2. The trapezoid is used to measure the area of a rectangle.
   梯形用于测量矩形的面积。
3. 3. The trapezoid is a common shape in mathematics and engineering.
   梯形是数学和工程中常见的形状。