例句與造句

1. Thus, just as hexagons have angles not less than 120?and cannot be used as the faces of a convex regular polyhedron because such a construction would not meet the requirement that at least three faces meet at a vertex and leave a positive non-convex regular polychora.
2. It's difficult to find convex regular polyhedron in a sentence. 用convex regular polyhedron造句挺難的