Visit-node takes a list of visitor functions, each with a signature (fn [node state]) that returns a context map, which can contain the keys: node, : state, : stop, or: jump.
visit - node获取一个访问者函数列表，其中每个函数都有一个返回上下文映射的签名(fn [nodestate])，上下文映射中可能包含键：node、： state、：stop或：jump。
He still issued every visitor a list of tasks, but he knew he had no control over whether those tasks got done.
他仍旧对每位探望者布置一堆任务，但知道自己已经无法监督他们是否去执行。
The Visitor in Listing 3 produces a map that associates each external page with a list of internal pages that link to it.
清单3中的Visitor 生成一个映射，将每一个外部页面与链接它的一组内部页面相关联。
This page should have a short descriptive paragraph or two, along with some sort of bulleted list that a website visitor can look at and very quickly get an idea of what the site is about.
首页上应该包含一段或两端简短的描述，并且最好用有序列表把重点部分罗列出来。这样可以帮助用户在很短的时间内就对你的网站主旨有一个大致的了解。
This page should have a short descriptive paragraph or two, along with some sort of bulleted list that a website visitor can look at and very quickly get an idea of what the site is about.
首页上应该包含一段或两端简短的描述，并且最好用有序列表把重点部分罗列出来。这样可以帮助用户在很短的时间内就对你的网站主旨有一个大致的了解。
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