具有七个顶点的多面体是稀少的.Polyhedra with seven vertices are rare.在所有共享一对伪顶点的二个分量间建立相邻关系.Establish the adjacency relation among all pairs of components which share a pair of pseudovertices.不要轻视上升到光辉顶点的梯阶.Do not despise the step whic...
The children could be seen hacking across the hillside on their ponies.可以看到孩子们正骑着小马穿过山坡。They drove the ponies into a corral.他们把矮种马赶进了畜栏。She has a mania for ponies.她特别喜欢小马....