在索引更新过程中，词法分析确定文档中单词的词元。
During index update processing, the lexical analysis identifies the lemmas of the words in the document, and the analysis adds this information to the text index.
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.
在状态转换图的基础上，构造词形表，为每个状态设计一段处理程序，使词法分析能从字符串中识别单词。
At the base of converted-state chart, building morphology table, designing a section of program for every status, in order to enable lexical analysis to recognize word from character string.
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