用UML表示代码元素有许多好处。

There are many benefits of representing code elements in UML.

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通过双击这些元素，您可以到达源文件中相应的代码元素。

By double-clicking these elements, you can reach the corresponding code elements in the source files.

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调用(Invocation)——调用或执行方法和其他代码元素时的点。

Invocation — Points when methods and other code elements are called or executed.

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So in your mind, if you are now the computer program and you are executing this thing from top to bottom, what just has happened verbally is we are stepping into the line of code that says sort left half of elements.

在你们看来，如果你现在是计算机程序,正在从上到下执行一系列指令，刚才所发生的就是我们现在已执行到了这行代码,它告诉你要对左半部分的元素排序。

哈佛公开课 - 计算机科学课程节选

We're going to call binary search, it's going to take the list to search and the element, but it's also going to say, here's the first part of the list, and there's the last part of the list, Well, it checks to see, is it bigger than two?

我们将要调用这个二分查找,它将会在列表里面搜索元素，假定这里是，列表的第一个元素,那里是列表的最后一个元素，代码内部到底做了什么？

麻省理工公开课 - 计算机科学及编程导论课程节选

And what it's saying semantically is, using that variable as my placeholder, have it walk through this collection, starting at the first thing, execute that code, then the next thing, execute that code, and so on.

它的语义意思就是，把这个变量应用为我的占位符，用它来遍历这个集合，从第一个元素开始，执行代码，然后下一个元素，再执行代码。

麻省理工公开课 - 计算机科学及编程导论课程节选