“directed tree”簡單造句，directed tree造句子

3、There are occasions when we want to refer to a directed tree, in which case it shall be said to be rooted at some vertex.

4、Its expansion gives all directed trees of the graph g.

2、如果此類材料能夠普遍用於光學產業，這一突破帶來的收益將是巨大的。

1、Using it the directed tree polynomial of a directed graph G can be found conveniently and efficiently.