例句與造句

1. There are two Coxeter groups associated with the " rectified heptacross ", one with the C 7 or [ 4, 3, 3, 3, 3, 3 ] Coxeter group, and a lower symmetry with two copies of pentacross facets, alternating, with the D 7 or [ 3 4, 1, 1 ] Coxeter group.
2. It's difficult to find rectified heptacross in a sentence. 用rectified heptacross造句挺難的