oriented tree meaning in English

定向树，有向树

A research for a comprehensive evaluating index system for urban - afforestation - oriented tree seeds of shenyang
沈阳城市绿化树种综合评价指标体系研究
In this thesis , we study the non - invertible linear finite autonomous automata and derive the following new results : 1 . a formula is given to count the number of the nodes of every level in a down - oriented tree of an autonomous automaton . then a necessary and sufficient condition is presented for the graph of an autonomous automaton to be an exact - equibranch down - oriented tree [ theorem 3 . 2 - 3 . 3 ]
本文研究了布尔代数上非可逆的线性内动机，取得了下列成果： ( 1 )给出了线性内动机下向树形中每一层节点的计数公式和下向树是等叉下向树形的判定条件[定理3 . 2 3 . 3 ] 。