例句與造句

1. The set of forbidden minors for the linklessly embeddable graphs was identified by : the seven graphs of the Petersen family are all minor-minimal intrinsically linked graphs.
2. However, there also exist minimal forbidden minors for knotless embedding that are not formed ( as these two graphs are ) by adding one vertex to an intrinsically linked graph.
3. It's difficult to find intrinsically linked graph in a sentence. 用intrinsically linked graph造句挺難的