Flex和Bison是用来解析文法的一对功能强大的组合。

Flex and Bison are a powerful combination for parsing grammars.

youdao

在解析文法想要方便地接受一个命令的多个版本时，国际化会很方便。

Internationalization is easy when the parsing grammar is intended to easily accept multiple versions of a command.

youdao

RecDescent的缺点是：由于它使用可扩展文法规则并且实时地进行记载和解析，所以比较慢。

The downside of Parse: : RecDescent is that it is moderately slow because it USES extensible grammar rules and on-the-fly lexing and parsing.

youdao