以下概念的区分 。Subgraph、proper subgraph ·Spanning subgraph、induced subgraph 。Walk ·Trail、Path、 。Circuit、Circle ·Distance、geodesic、diameter以下概念的区分 • Subgraph、proper subgraph • Spanning subgraph、induced subgraph • Walk • Trail、Path、 • Circuit、Circle • Distance、geodesic、diameter