本文在这里并不讨论关于AST的任何细节，除非当扩展需要向生成的代码添加新元素时，才会涉及到一些。通过访问AST的方法来做到这一点。

This article will not discuss the AST in any detail here, except to say that when the extension needs to add new elements to the generated source it does so by calling methods on the AST objects.

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这是另一种内容升级方法；这会简洁地扩展和更新玩家可以访问的内容。

This is a content upgrade of a different kind; it gives you a nice, neat way to expand and refresh the content available to the gamer.

youdao

此访问方法进一步扩展为了xml路径语言(XML path Language, Xpath)的一个子集。

This method of access extends further to a subset of XML Path Language (XPath).

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