orthopyramid

例句：

1. 1.The octahedron is a type of regular polyhedron with eight faces.
   八面体是一种具有八个面的正规多面体。
2. 2. The orthopyramid has a unique shape that makes it difficult to move around.
   正多面体有一个独特的形状，这使得它难以移动。
3. 3. The construction of the orthopyramid required careful planning and execution.
   建造正多面体需要仔细规划和执行。