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摘要：The article presents an email interview with Dr.Joan L.Bybee;Distinguished Professor at the University of New Mexico in the Department of Linguistics and the 2004 President of the Linguistic Society of America.Her research interests include morphology;phonology;typology and universals;grammaticalization and psycholinguistics.Dr.Bybee started the usage-based studies of language from as early as the 1970s.And it is found that in recent years;usage-based linguistics or usage-based theory(UBT) has gained currency in the cognitive and functional approaches to language.In this interview;Dr.Bybee informs us of the most important aspects of UBT;including the basic tenet;the nature of language as a complex adaptive system;effects of frequency on language structure;methodological implications;and so on.