第3行将允许索引使用英文词法。
WordNet：词法数据库文件。
执行此匹配的第一步叫做扫描或词法分析。
The first step in performing this match is called scanning, or lexical analysis.
扫描，也称词法分析。
语法树只能够表现出源代码的词法和句法结构。
Syntax trees only represent the lexical and syntactic structure of the source code.
如果记号赋予器未遇到这两个记号，则返回词法错误。
If the tokenizer encounters neither token, it returns a lexical error.
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.
WordNet是英文单词及其词法关系的数据库。
WordNet is a database of English words and lexical relationships between them.
同样，这也不是什么火箭科学，只不过是词法上的变异。
Again, this isn't rocket science — just a little bit of a lexical twist.
以下是对一个句子进行词法分析和解析的示例。
应该给出关于解析和词法分析的一个简短指南。
在词法上确定范围是指在本地环境中定义变量。
Lexically scoped variables refer to the local environment in which they were defined.
转换图是用于词法分析器和解析器的公共实现。
Transition diagrams are a common implementation for lexers and parsers.
所生成的词法解析器可能会在检测到某个符号之前读入多个字符。
The generated lexical parser may read multiple characters ahead before it detects a token.
词法上的灵活性在诸如回归测试和数字签名等方面带来了一些问题。
This lexical flexibility causes problems in areas such as regression testing and digital signatures.
这门语言简单到甚至不需要有一个符号表来进行词法分析。
The language is simple enough that it does not even require a symbol table to parse.
了解每种明智建议背后的理由，避免对XML任意施加词法限制。
Read the rationale behind the very sensible recommendation to avoid arbitrary lexical restrictions on XML.
注意到，它能够引用词法作用域中的任何变量（本例中是min）。
Observe that it can refer to any variable live in the lexical scope (in this example, min).
像许多动态语言一样，这些函数在它们被定义的范围内创建了词法闭包。
These functions create a lexical closure on the scope in which they were defined like blocks in many dynamic languages.
它支持词法，因此搜索单词 “cats”还会找到词根 “cat”。
It supports morphology, so a search for the word "cats" also finds the root word "cat."
毫无疑问，仅从词法上下文捕获不变的状态这一限制，令程序员非常不满意。
There's no doubt that the restriction to only capturing immutable state from the lexical context is quite irritating to programmers.
下面我们将编写以xml形式从WrodNet中抽取词法信息的基本代码。
Here, I build on the basic code to extract the lexical information from WordNet in XML form.
这是因为在closure的关键字use中指定的变量在词法上确定范围。
That's because variables specified in a closure's use keyword are lexically scoped.
Lex是一种词法分析工具，它可以用来从源文本识别特定结构的文本字符串。
Lex is a lexical analysis tool that can be used to identify specific text strings in a structured way from source text.
本场景中的静态关系将这四个词法不同但语义相同的表示形式关联在一起。
The static relationship in this scenario correlates these four syntactically different but semantically equivalent representations.
或者Perl4又如何呢？ Perl4到Perl5之间，词法闭包被加进来了。
Or how about Perl 4? Between Perl 4 and Perl 5, lexical closures got added to the language.
你知道，从词法方面并没有太多的发挥空间，但在结构和语法水平方面却有发挥余地。
From the lexical point of view, you know that there isn't much room to work with, but there is a room in the structural and syntax level.
因此，Perl5之上的P：RD是一个解析器与词法分析器的强大组合。
Thus, p: : RD on top of Perl 5 is a powerful parser and lexer combination.
实践中，宏的作用通常由其它一些Lisp特性比如词法闭包以及rest参数大大加强。
In practice their usefulness is greatly enhanced by other Lisp features like lexical closures and rest parameters.
实践中，宏的作用通常由其它一些Lisp特性比如词法闭包以及rest参数大大加强。
In practice their usefulness is greatly enhanced by other Lisp features like lexical closures and rest parameters.
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