Competing sound changes: Evidence from Kam-Tai, Miao-Yao and Tibeto-Burman
时间交错的语音变化：从壮侗、苗瑶、藏缅语系取得的证明
Matthew Y. Chen 陈渊泉

Abstract 摘要
The concept of competing sound changes overlapping in time lies at the heart of lexical diffusion. However, empirical evidence reported to date instantiate, for the most part, only cases of single aborted sound changes. The predicted phenomenon of temporally intersecting phonological pro-cesses has remained elusive. Against this backdrop, this paper documents several cases of residues resulting not merely from aborted sound changes but from the overlapping chain shifts and partial feeding/bleeding relations holding among diachronic processes.

词汇扩散的假设是基于多项语音变化同时发生或者在时间上产生交错的现象，但是所见的文献大体上仅仅能说明单独语音变化的中途＂流产＂而不足以证明词汇扩散是两个年代冲突的变化所造成，本文提供一些有关历史数据，并略为讨论＂连锁＂变化的概念。

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