【摘要】 本文研究语言Ｌ的附着Ａｄｈ（Ｌ）的句法结构，借助于Ｌ的语法分析树，我们分析了Ａｄｈ（Ｌ）的句法特征，提出并证明了正规语言和上下文无关语言附着的叠代定理，从而解决了这两类语言的附着的句法结构问题。另外，应用引理证明了某些附着不是正规语言的附着或上下文无关语言的附着。更多还原

【Abstract】 This paper studies the syntactic structure for adherence Adh (IM) of a language L. With the aid of the parser tree of L, the authors analyse some characteristics of words belonging to Adh (L), and prove iteration theorems for adherences of regular languages and context-free languages, thus solving the problem on syntactic structure for the adherence of corresponding languages. Moreover, they present the application of itera-tion theorems to prove some adherence of languages are not adherences of regular languages or context -free languages.更多还原