You define a language by defining the structure of its abstract syntax tree, its abstract grammar.

定义语言就是定义它的抽象句法树，它的抽象文法。

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An algorithm of the extracting Lexicalized Tree Adjoining Grammar (LTAG) from Penn Chinese corpus was presented.

提出了一种从宾州中文语料库中自动提取词汇化树邻接文法(LTAG)的算法。

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In order to preserve the two dimensional message of the character, a tree grammar is used.

为了保持汉字的二维结构信息，采用了树状文法。

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Interview everyone who has a grudge against him--old secretaries who had to correct his grammar on the letters they typed, the neighbor who had to deal with the leaves from the Hatch maple tree.

CNN: The Republicans were right, but