引言发音与知觉的关系是第二语言语音研究中至今仍在探索的一个问题。Best曾提出颇有影响的知觉同化模型(Perceptual Assimilation Model),认为对第二语言音位的知觉有以下三种关系:(1)将第二语言中对立的两个范畴同化到母语中也互相对立的两个范畴中,因此能够很好地区分第二语言中的两个范畴;(2)将第二语言中对立的两个范畴同化到母语中的一个范畴中,并且认为它们与母语中的这个范畴的相似度一样大, INTRODUCTION The relationship between pronunciation and perception is an issue that is still being explored in the study of second language speech. Best proposed the influential Perceptual Assimilation Model, which considers the following three relations to the perception of second language phonemes: (1) Assimilating the two opposite categories in the second language to one another Therefore, the two categories in the second language can be well distinguished; (2) the two categories of opposition in the second language are assimilated into one category of mother tongue, and they are considered The same degree of similarity in this category,