单词：directed edge
directed edge的用法和样例：
例句
- Each row in a database table represents a directed edge.数据库表中的每一行表示一个定向边。
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图 graph 子图 subgraph 有向图 digraph(directed graph) 无向图 undigraph(undirected graph) 完全图 complete graph 连通图 connected graph 非连通图 unconnected graph 强连通图 strongly
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