它的展开式将给出图g的全部有向树。
它没有对消项，这一点优于有向树法。
这个方法是完全树法与有向树法的统一。
This method is the unification of complete trees method and directed trees method.
应用它可以方便且有效地求出一个有向图G的有向树多项式。
Using it the directed tree polynomial of a directed graph G can be found conveniently and efficiently.
有向树计数的大小，是影响线性网络拓扑分析运算效率的一个重要因素。
Counting directed trees plays an essential role in computational efficiency of topological analysis in the linear network.
有向根树就是只有一个顶点的出度为0，其余顶点的出度均为1的有向树。
A directed rooted tree refers to a directed tree which has one vertex with out-degree 0 and all the other vertices with out-degree 1.
本文在对“王氏代数”、“k -树组”和“MINTY”这三种求有向树组的典型方法进行分析之后，提出了一种生成有向树组的拓扑方法。
Having analysed the "W-algebra", "K-tree terms" and "MINTY", the three typical methods of generating direct tree terms, the paper advances a new topological one.
啄木鸟在啄木头的时候，每秒头部向树撞击20次，你估计觉得这样它会需要一个坚如钢铁的脑袋来得以生存，但事实上，啄木鸟的脑袋是相对较软的，每只啄木鸟在出生时，鸟喙后长有一个软的海棉状的物质，用来吸收啄木头时所产生的震动。
Instead, the reality is that woodpecker heads are relatively soft. Each bird is born with a soft, sponge-like mass behind its beak that absorbs the shock created by pecking.
算法来找到一个层次树在一个有向无环图吗？
Algorithm to find a hierarchy tree in a directed acyclic graph?
而树的形状也各不相同，有笔直向上似岑天树木的，有向两旁伸展呈伞状的，看！
The shape of the tree also each are not identical, have straight upward cen day of trees, both sides have to stretch of umbrella, look!
如果冠状系统是基本的，已经证明其R -旋转图至少包含2棵有向根树。
It is proved that the R-rotation graph of a elementary coronoid system is a multiple directed rooted tree containing at least 2 trees.
这种曲线树是采用树的结构来描述曲线，其内部元素是有向相对高度。
Binary trees composed of directed relative height are adopted to describe curves.
这种曲线树是采用树的结构来描述曲线，其内部元素是有向相对高度。
Binary trees composed of directed relative height are adopted to describe curves.
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