如果在同一个文件里混用多种语言，必须保证文法不会出现二义性，也就是说所有的输入都只能存在一种解释。
If you want to combine languages inside of a file, you have to be sure that the resulting grammar isn't ambiguous, i.e. that for each input there is only one way to interpret it.
之后把它转换成ebnf文法，再通过一系列变换转化成无二义性的SI - NS图，根据此图就可以写出相应的各个子程序。
After transforms them the EBNF grammars and unambiguous SINS charts, we may write the corresponding procedure according to every chart.
本文以SLR(1)分析器为例介绍了两种为二义性文法构造语法分析器的方法，并通过实例对两种方法的优劣进行了比较。
In this article, two methods of constructing SLR (1) analyzer for grammar with ambiguity are introduced and the two methods are compared with each other by examples.
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