?阶层式有向图
... hierarchical data graph 层次数据图 hierarchical directed graph 阶层式有向图 hierarchical graph language 阶层式图形语言 ...
?分层有向图
... equivalent directed graph 等价有向图 hierarchical directed graph 分层有向图 loop free directed graph 无循环定向图 ...
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。