The object of the study of the information structure should be the deep cognitive structure rather than the surface sentence structure.
话语信息结构理论的研究对象是底层的认知结构，而非表层的句子结构。
The deep structure can mostly be presented as the surface structure made up of an active sentence or a passive one, by means of the unit noun characteristic of transformation function.
该深层结构多半可以通过单位词的转换功能映现为主动句或被动句的表层结构。
The transformational grammar shows that the deep structure of a sentence can be transformed into its surface structure suitable to the grammar.
转换语法指出转换就是将句子的深层结构转换成符合句子语法的表层结构。
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