Starting from a sentence consisting of a single distinguished nonterminal, 是现在分词短语作状语 called the goal symbol是过去分词作非限制性定语, a given context-free grammar 是主语specifies是谓语a language是宾语, namely, the (perhaps infinite) set of possible sequences ofterminal symbols 是同位语后面是定语从句 that是关系代词 代替先行词symbols引导定语从句 并作定从中的主语...
