您可以下载有关这篇文章以及以前专栏文章的所有相关代码； 请参阅副栏 获取代码。

You can download all the relevant code for this and previous columns; see the sidebar, Getting the code.

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然而，Head First 的编辑相当直白地说出这个谚语，“一副图画能够比得上千字的描述”，并且他们肯定找到了用图片取代冗长文章的好方法。

Well, the Head First editors took the saying, "A picture is worth a thousand words" quite literally, and they definitely found a good way to use pictures as a substitute for long, drawn out text.

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