The AST is a tree representation of the source code that contains everything from variable declarations to function definitions and method invocations.

AST是源代码的树形表示，它包含了从变量声明到功能定义和方法调用的全部内容。

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To see more clearly, this distinction of when you would use a scanner vs. an AST, consider the code in Listing 10.

要更清晰地了解何时使用扫描程序与何时使用 AST 之间的差别，请考虑清单 10 中的代码。

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L ast week, I went to a dinner party that gave me a bout of indigestion.

上周我去参加了一个晚宴，结果害得我消化不良。

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The AST will receive a small royalty, in the neighborhood of 4-5% of revenue and 90% of those funds collected are distributed to the public school system.

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