string graph造句

例句与造句

1. Every circle graph, as an intersection graph of line segments ( the chords of a circle ), is also a string graph.
2. Every chordal graph may be represented as a string graph : chordal graphs are intersection graphs of subtrees of trees, and one may form a string representation of a chordal graph by forming a planar embedding of the corresponding tree and replacing each subtree by a string that traces around the subtree's edges.
3. It's difficult to find string graph in a sentence. 用string graph造句挺难的