... 扩充的功能操作员控制板 expanded function operator panel，EFOP 扩展文法 expanded grammar 扩充项 expanded item ...
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不需懂得太多就可以理解扩展文法，在对付大项目时，这对您非常有帮助。
You don't need to know much to understand and extend the grammar, which can be very helpful when you're tackling large projects.
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.
扩展文法处理（extend-grammar process）规则：这个 process 规则可以由一个查询或定义组成。
The extend-grammar process rule: The process rule can consist of a query or a definition.
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