A scanner reads in the individual characters of a buffer and returns symbols (called tokens) that the parser will understand — such as keywords, operators, and language-specific punctuation.
扫描程序读取缓冲中的单个字符并返回解析器能理解的记号(称做标记)——如关键字、操作符及针对特定语言的标点符号。
Use keywords (noun=principal words) or keyphrases to help you understand the general ideas.
关键词或者关键的词组能够帮助理解文章大意。
The simplest to understand is: the most important keywords on your site.
我们可以从多个方面去理解。最简单的理解是：你网站最主要的关键词。
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