精选优质文档-倾情为你奉上lDesign features（定义特征）:the distinctive features of human language that essentially make human language distinguishable from languages of animals.Synchronic（共时的）: said of an approach that studies language at a theoretical “point” in time. Diachronic（历时的）: said of the study of development of language and languages over time.Prescriptive（规定式）: to make an authoritarian statement about the correctness of a particular use of language.Descriptive（描写式）: to make an
