“两折调”(double circumflex tone)本来以为是一种罕见的调形,但其实不算太少见。本文搜集、考察全国六大方言区27个方言点的两折调,给各种曲线分类,展示它们的区别作用,并探讨其可能的去向。最后还简要讨论了特征理论、标记理论、现有声调理论的不充分处。 “Double circumflex tone” was originally thought of as a rare shape, but it is not too rare. This article collects and examines the two folds of 27 dialects across the six major dialectal areas in China, classifies the various curves, shows their distinctive roles and explores their possible future. Finally, the essay also briefly discusses the feature theory, mark theory and inadequate existing tone theory.