研究课题涉及社会语言学、语篇分析，英语语言教学等领域。
His research areas involve sociolinguistics, discourse analysis, and teaching of the English language.
语言的基本功能在于社会交际，语篇是它的基本单位。
With the text as its basic unit, the essential function of language is to communicate.
语言的基本功能在于社会交际，语篇是它的基本单位。
With the text as its basic unit, the essential function of language is to communicate.
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