undirected graph

例句：

1. 1. In this graph, each node represents a city and the edges represent the connections between cities.
   在这个图中，每个节点代表一个城市，边表示城市之间的连接。
2. 2. The undirected graph represents the relationships between the different elements in the system.
   这个无向图表示系统中不同元素之间的关系。
3. 3. The undirected graph is used to model the interactions between two parties without specifying which party will bethe source or destination of the interaction.
   这个无向图用于模拟两个方之间没有指定哪个方是交互源或目的地的相互作用。