Most of the time, subtags are displayed in a hierarchical tree fashion.
大多数时候，子标记以分层的树的形式显示。
A computer language can be viewed as a hierarchical tree of language constructs.
一门计算机语言可以看作是语言结构的一个分层级的树。
A tree is a hierarchical structure that defines a parent-child relationship.
树是一个定义了“父子”关系的层次结构。
A hierarchical user interest model is a tree whose nodes are the single interest vectors.
一个层次结构用户兴趣模型是一个以单个兴趣向量为节点的树。
A management model of distributed network security system with tree-like hierarchical structure was introduced.
提出了一种采用树形层次结构的分布式网络安全系统管理模型。
A management model of distributed network security system with tree-like hierarchical structure was introduced.
提出了一种采用树形层次结构的分布式网络安全系统管理模型。
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