directed tree graph 有向树图
Fault tree graph 事故树
1-tree graph 树图
code tree graph 码树图
upper tree graph 图的上树
cycle -tree graph 圈五树形图
tree graph grammar 树图文法
tree-graph grammar 树图文法
You are drawing a graph, not a tree (although trees are also graphs).
您是在绘制图而不是树（尽管树也是图）。
Applications can also retrieve a single item or a tree (graph) of items from the repository using this service.
应用程序还可以使用此服务从库检索单个项目或项目树(图形)。
A cyclic object graph cannot be transformed into a tree structure.
一个循环对象图不能够转换为树结构。
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