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 [node state])，上下文映射中可能包含键：node、： state、： stop或：jump。

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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。

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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。

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There are so many sights to see and things to do in New York City, but visiting a few of these classic hotel bars should not be excluded from any visitor's list.

BBC: New York City's classic hotel bars

We can now add soil composition to the list, as Curiosity became Earth's first visitor to the Red Planet to both gather and analyze Martian soil on its own.

ENGADGET: NASA Curiosity rover digs Mars, finds sulfur, chlorine and organic traces of unknown origin