关键在于，实际上我们正在寻找的是适用于每种类型的、惟一的、与上下文无关的标识符。
The key point here is that you are indeed looking for unique, non-context-related identifiers for each type.
因为这些规则与实验对象、与上下文无关，所以很方便应用到计算机游戏设计上去。
Because of the species- and context-free nature of these rules, they can easily be applied to novel domains such as computer game design.
下推格值自动机接受的词语言与上下文无关格值文法生成的词语言具有等价关系。
The equivalence of words language accepted by PDLA and generated by CFLG is proved.
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