语言的纯理功能包括三个部分：概念功能、人际功能和语篇功能。
Besides, the metafunction of language involves ideational metafunction, interpersonal metafunction, and textual metafunction.
本文以韩礼德的系统功能语法为基础，从三大纯理功能中的语篇功能出发，对若干律师辩护词的主位进行了统计分析。
This paper, on the basis of the widely accepted Functional Grammar developed by Halliday, attempts to investigate and analyze themes in a lawyer's defense documents.
有些语言学家认为语篇分析是基于语篇内部句子语法层的分析，而系统功能语法中的三大纯理功能则为句子语法层的分析提供了系统的理论和有效的分析方法。
Some linguists hold that context analysis is on the semantic grammatical basis of a context, and the three meta-function of systemic-grammatical grammar provide it a systematic and effective way.
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