DOSFSG is a kind of context free grammar, DOSFSS is a kind of semantics with operation set.

其中文法部分采用了上下文无关文法，语义部分则是一个带操作集的语义系统。

youdao

If I have a context free grammar, it doesn't generate the programs. I still have to write them.

如果我有一个上下文无关的语法，它并不能自动产生程序，我还是得写程序。

youdao

If you work with a context-free grammar, the structure of n-gram (see Resources) might be what you require.

如果您使用一种上下文无关的文法，那么n元语法的结构(参见参考资料)可能是您所需要的。

youdao

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