本文是本论文集的引论。它首先阐述了社会语境是决定语言表达用语选用的一个因素这个不言而喻的真理。其次,它追溯了社会语境研究在现代语言学各历史阶段和分支领域被忽视的原因。再次,它描述了社会语境因素在最近语言学研究中重新受到重视的几个根源以及对它的研究在当前语言学、心理语言学、社会心理学、认知心理学中的现况。最后,它简述了本书各章的研究课题,说明了它们之间的联系,并旁及其它相关或类似研究。 This article is an introduction to this essay. It begins with the self-evident truth that social context is a factor that determines the choice of language to express. Second, it traced the reasons why social studies were neglected in all historical stages and branches of modern linguistics. Third, it describes several sources of re-emphasis of social context in recent linguistic studies and the current state of research on it in current linguistics, psycholinguistics, social psychology and cognitive psychology. Finally, it outlines the research topics in each chapter of the book, illustrates the links between them, and other related or similar studies.