tree graph的用法和样例：
例句
- Especially, the adjacent tree graph and line graph are both included as special cases of our generalization.
特别，邻接树图和线图是我们推广的特殊情况。 - Introduced in this paper is the forest graph of a connected graph which is a generalization of the tree graph.
摘要本文中引进了连通图的森林图，它是树图的推广。 - The tree grows luxuriantly flourishing, the fountain trickle starts to flow.
树木啁欣欣向荣，泉水啊涓涓始流。
