扩展文法定义（extend-grammar definition）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.
为机器翻译设计和研制的词典和文法，是机译系统的核心，是机译研究中的关键。
The lexicon and the grammar developed for machine translation(MT) are the core of the MT system, and the critical problem in MT research and development.
正规集是对许多语言理论起核心作用的一类语言，研究正规集的性质有助于有限态文法的文法推断和句法分析的研究以及正规集的自动识别。
The study of properties ofregular sets is useful to grammar inference and syntax analyses for finite-state grammars such that regular languages can be recognized automatically.
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