例句與造句

1. These are the triangular pyramid or tetrahedron, cube ( regular hexahedron ), octahedron, dodecahedron and icosahedron:
2. The " hemi " part of the name means some of the faces form a group with half as many members as some regular polyhedron here, three square faces form a group with half as many faces as the regular hexahedron, better known as the cube hence " hemihexahedron ".
3. It's difficult to find regular hexahedrons in a sentence. 用regular hexahedrons造句挺難的