例句與造句

1. The correspondence between projective polyhedra and centrally symmetric spherical polyhedra can be extended to a Galois connection including all spherical polyhedra ( not necessarily centrally symmetric ) if the classes are extended to include degree 2 tilings of the projective plane, whose covers are not polyhedra but rather the polyhedral compound of a non-centrally symmetric polyhedron, together with its central inverse ( a compound of 2 polyhedra ).
2. It's difficult to find symmetric polyhedron in a sentence. 用symmetric polyhedron造句挺難的