It creates a parser object around a grammar.

它围绕着文法创建解析器对象。

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Each p: : RD grammar becomes an object blessed into the p: : RD class, with each rule in the grammar as a method you can use to cause actions to happen.

每个P： RD语法成为P： rd类中的一个对象，语法中的每一个规则都可以作为用来执行动作的方法。

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According to this transformation grammar, a program transformation algorithm can transform source language programs into object language programs.

程序转换算法根据转换文法，可把源语言程序转换为目标语言程序。

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