polyhedron simplification

例句：

1. 1.The polyhedron is a shape with many faces.
   多面体是一种有多个面的几何形状。
2. 2. The polyhedron was used to represent the shape of a cube.
   多面体被用来表示立方体的外形。
3. 3. The polyhedron simplification technique reduces the number of faces in the shape.
   多面体简化技术减少了形状中面的数量。