But tree and bush are hardly that, since there is no way to define a tree versus a bush. The two categories grade insensibly into one another.

但树和灌木就是很难区分的，因为没有一种方法来区分一棵树和一株灌木，其中一种不知不觉地渐变为另一种。

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But the only way to get there is to grab a vine and swing off the tree.

而唯一到达那的方法就是离开现在赖以生存的大树。

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The XML Infoset is very similar to a tree structure and it is easy to construct a graph that is not a tree (just connect the nodes in such a way so that there is no obvious root node).

XML Infoset与树结构非常相似，而且易于构造不是树的图(只需以不产生明显的根节点的方式连接节点)。

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