菜单是允许站点访问者访问内容页的链接的列表，在这个示例中，这些页面适用于工作、家庭、朋友和假期图片。
Menus are list of links that allow site visitors to access content pages, in our example the pages for work, family, friends and vacation pictures.
我们已经接收到了几封来自站点访问者的电子邮件建议，而我们的开发人员邮件列表也提供了一种交换建议和意见的方法。
We had received several E-mail Suggestions from visitors to the site, and our developer mailing list also served as a way of exchanging Suggestions and comments.
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。
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.
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