tetrahedral function

例句：

1. 1. The shape of the building is a tetrahedral design.
   这座建筑的形状是四面体设计。
2. 2. The tetrahedron has four equilateral triangles on each face.
   四面体的每一面都有四个等边三角形。
3. 3. The tetrahedron is a simple geometric figure with four faces and four vertices.
   四面体是一个有四个面的简单几何图形，有四个顶点。