本文讨论古音构拟中的两条原则,理性原则和兼容性原则,以及构拟所以凭借的各种证据的权重问题。当证据互不相容时,理性原则可以帮助确定孰重孰轻:当证据兼容时,权重就会因此而提高。 This article discusses the two principles, the principle of rationality and compatibility in the formulation of ancient sounds, and the weighting of the various forms of evidence upon which one depends. When the evidence is incompatible with each other, the principle of reason can help determine what is more important: when evidence is compatible, the weight is increased.