扩展文法定义（extend-grammardefinition）规则：该可扩展文法的核心是 definition 规则。
The extend-grammar definition rule: The heart of this extensible grammar is the definition rule.
扩展文法定义（extend-grammardefinition）规则：该可扩展文法的核心是 definition 规则。
The extend-grammar definition rule: The heart of this extensible grammar is the definition rule.
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