Morphologically conditioned phonology, where a particular phonological alternation or requirement holds only for a subset of lexical items or in a subset of morphological contexts, is well documented. This paper expands on the literature by examining phonological alternations where two independent triggering morphemes must both be present for a phonological alternation to apply. Several cases of doubly morphologically conditioned phonological alternations, from a diverse set of languages, are described. The existence of morphologically conditioned phonology with two triggers informs our models of the interface between morphology and phonology, in that phonological operations must be able to reference the presence of more than one morpheme simultaneously. A range of possible analyses are considered, including those set in Stratal OT, Indexed Constraint Theory, Cophonology Theory and Cophonologies by Phase Theory. A Cophonologies by Phase account is found to be optimal, where multiple morpheme-specific phonological requirements accumulate and co-trigger alternations within a single spell-out domain.

中文翻译：

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具有两个触发器的形态条件音系

形态条件音韵学，其中特定的语音交替或要求仅适用于词汇项目的子集或形态上下文的子集，已被充分记录。本文通过检查语音交替来扩展文献，其中两个独立的触发语素必须都存在才能应用语音交替。描述了来自多种语言的双重形态条件语音交替的几个案例。具有两个触发器的形态条件音系的存在为我们的形态和音系之间接口的模型提供了信息，因为音系操作必须能够同时引用多个语素的存在。考虑了一系列可能的分析，包括 Stratal OT 中设置的分析，Indexed Constraint Theory、Cophonology Theory 和 Cophonology by Phase Theory。发现按阶段的音韵学帐户是最佳的，其中多个特定于语素的音位要求在单个拼写域内累积并共同触发交替。