四块小砾石,四种颜色,四种形状,四种质地。质地各有不同,但都细腻坚硬,这是它们成为可玩之石的基本条件之一。A石黑色,是个椭球体;B石色灰,内含浅黄细粒,近似三棱锥;C石金黄带有灰黑纹理,近似五面体;D石橙褐,近似六面体。四块石头被说成四种几何体,就有三种用了“近似”修饰,盖因“几何体”是个数学名词。数学 Four small gravel, four colors, four shapes, four kinds of texture. Different texture, but are delicate and hard, which is one of the basic conditions for them to become playable stone. A stone black, is an ellipsoid; B stone gray, containing light yellow fine particles, approximately triangular pyramid; C stone golden with gray-black texture, approximate pentahedron; D stone orange brown, approximate hexahedron. Four stones are said to be four kinds of geometry, there are three with “approximation ” modification, cover because “geometry ” is a mathematical noun. mathematics