Design features(定义特征):the distinctive features of human language that essentially make human language distinguishable from languages of animals、Synchronic(共时得): said of an approach that studies language at a theoretical “point” in time、 Diachronic(历时得): 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 objective and systematic account of the patterns and use of a language or variety、petence(语言能力): unconscious knowledge of the system of grammatical rules in a language、对于一门语言得语法规则系统得无意识获得得知识
Performance(语言运用): the language actually used by people in speaking or writing、人们说话写作时实际使用得语言
Langue(语言): the language system shared by a “speech mun