The combinational pattern in a linear formula may be called a phrase structural rule, or rewrite rule. 短语结构规则是一组句法重写规则。
Language is a system of structure rules and culture-specific social behavior rules that humans use to understand the world and express themselves. 语言是人类用来认知世界及进行表述的一种结构规则和因文化而别的社会行为规则体系。
