短语结构规则(phrase structure rule)，也称之为“改写规则”（rewrite rule）。
根据短语结构规则，短语和句子可以无限循环地组合起来。
These rules can generate an infinite number of sentences, and sentence with infinite length, due to their.
从形式上讲，一条短语结构规则包括两部分，产生式规则和合一等式。
Each rule includes two parts: a context free rewrite rule and a series of unification equations.
用线性式对这种组合模式进行重写并把它称作短语结构规则或重写规则。
Phrase structural rules: The combinational pattern in a linear formula may be called a phrase structural rule or rewrite rule.
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