Adequacy

充分性

A term used in linguistic theory as part of the evaluation of levels of success in the writing of grammars. Several sets of distinctions based on this notion have been made. External adequacy judges a grammar in terms of how well it corresponds to the data (which are ‘external’ to the grammar); internal adequacy is a judgement based on the ‘internal’ characteristics of the grammar, such as its simplicity, elegance, etc. From a different point of view, grammars are said to be weakly adequate if they generate some desired set of sentences; they are strongly adequate if they not only do this but also assign to each sentence the correct structural description.

语言学理论中评价语法编写水准的一条标准。外部充分性是按一部语法在多大程度上与数据（对语法而言属于“外部”）相吻合来作出评判；内部充分性是根据语法的“内部”特性，如简单性和精致性等，来作出评判。换一个角度，如果一部语法能生成希望得到的某个句子集合，就说这部语法具有弱充分性；如果一部语法不仅能做到这一点，还能给每个句子指派正确的结构描写，就说这部语法具有强充分性。