词法与句法。
语法因素表现为汉语词法与句法的一致性，这使短语和略语转化为词。
Grammar factor refers to the agreement between the Chinese lexicon and syntax, which accounts for the acceptance of some free phrases and abbreviations as words.
句法注意：在本章和之后的章节中，描述句法时使用与词法分析时不同的扩展BNF记法。当某个句法规则(可能是可选的)具有如下形式。
Syntax Notes: in this and the following chapters, extended BNF notation will be used to describe syntax, not lexical analysis. When (one alternative of) a syntax rule has the form.
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