说明：  利用GLUT提供的9种三维实体分别绘制圆锥体、四面体、正方体、正十二面体、正二十面体、正八面体、球体、圆球体和茶壶模型，并应用鼠标交互菜单实现实体图和线框图之间的切换。
(9 provided by GLUT were drawn three-dimensional solid cone, tetrahedron, cube, dodecahedron, icosahedron, octahedron, sphere, spherical body and the teapot model, and apply mouse interactive menu map and wireframes for entity to switch between.)