这种专门化的映射类型保证主题集合符合入门书籍的结构。

This specialized map type ensures that the collection of topics conforms to a basic book structure.

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映射：映射类型约束了主题集合的结构。

Map: the map type mandates the structure for a collection of topics.

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第一个实现原则是：使用策略集合在结构的入口处分别标记每个工作条目。

The first implementation principle is: Individually tag every work item, on entry to the architecture, with a policy set..

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And the answer is basically anything.

这些结构的集合来做什么呢？

麻省理工公开课 - 计算机科学及编程导论课程节选

I can write it explicitly. I can write it inside of a FOR loop. And we've started to add, and we'll see a lot more of this, examples of collections of structures so that we don't just have to do something that can be easily described as walking through a set of things but can actually be a collection that you walk through.

我可以明确的写出来,我可以把它在FOR循环的内部写出来，然后我们开始学习了add这个运算符,我们会在以后学习很多的,集合的数据结构的例子,这样一来我们可以进行一些,很简单的遍历集合的操作,我想要为大家指出的最后一件事情是。

麻省理工公开课 - 计算机科学及编程导论课程节选

That is basically saying, given some collection of data, I want to have again a looping mechanism, where now my process is, walk through this, the collection one element at a time. And for that, we have a particular construct, called a FOR loop.

现在我的过程就是,通过一个个访问这个集合中,的元素的方式，来遍历这个集合,为了达到这个目的，我们有一个特定的结构，成为FOR循环。

麻省理工公开课 - 计算机科学及编程导论课程节选