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社会语言学家认为语言是一个动态系统,社会的变化为语言的变化提供了重要条件。社会语言学的任务就是进一步研究语音系统是怎样在全社会交际不间断的前提下逐渐演变的。拉波夫把在共时变异中找出年龄差异的研究称为显象时间研究,而把从不同时间中获取同一变异材料的变化的研究称为真实时间研究。
Sociolinguists think that language is a dynamic system, and social changes provide important conditions for the change of language. The task of sociolinguistics is to further study how the phonetic system evolved under the precondition of uninterrupted social communication. Labov called the study of age differences in the synchronic variations the imaging time study and the study of the changes that took the same variation material from different times as the real time study.