The second is the sociolinguistic approach which focuses on the research of the characteristics, the motivations and the functions of code-switching from social aspects.
社会语言学角度，主要从社会因素分析语码转换的特点，动机和转换功能。
Using sociolinguistic methods to collect data, the paper makes an analysis of the conversational functions of Chinese-English code-switching (CS) on EFL college campus.
本文运用社会语言学方法收集语料，对我国大学校园英汉语码转换的会话功能进行探讨。
Then the writer analyzed the characteristics of code-switching with register theory and revealed the restrictive functions of this theory in code-switching.
第三步，作者运用语域理论分析语码转换的特点从而揭示这一理论在语码转换中的制约功能。
Then the writer analyzed the characteristics of code-switching with register theory and revealed the restrictive functions of this theory in code-switching.
第三步，作者运用语域理论分析语码转换的特点从而揭示这一理论在语码转换中的制约功能。
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