曾侯乙编钟能旋宫的“知识”,在国内外广泛传播，但这却是一个未经求证的假设。相关研究仅指其中23件楚系乐钟的十二律名，而未涉其十二律(均)旋宫内容及各均的“五音不全”现象，且还回避了32件以六律为宫的曾系乐钟，尤其是在全架编钟之核心的长枚甬钟上，众多变声有何作用与“无浊均”如何转调的问题尚待探讨。文章从变声的名实关系出发，认为该套甬钟既有十二声名中的“三角”“四曾”,又独拥“四变”与“二甫页下角”,这些定均变声被设计为相邻浊均正声的等音替代，故其表面只有六均十二声，而实际具备“显六+隐六”十二均及各均五声，并在其间使用隔八旋宫法。这一揭示首次从长枚钟铭的六均视角获证，公元前五世纪，中国已具有旋奏十二均五声乐曲的乐器与十二均旋宫理论的重大音乐成就。

The knowledge that Zeng Houyi's chime bells could perform twelve-temperament as the tonal key- note(but may not always the modal tonic) for cyclic modulation has been widely spread both domestically and internationally,yet such knowledge remains an unproven hypothesis.The relevant research only refers to the twelve- temperament names of 23 Chu-style bells from the entire set of Zeng Houyi's chime bells, but not the content of their twelve-temperament cyclic modulation and incomplete pentatonic scales.It also avoids 32 Zeng-style bells from the Zeng Houyi's chime bells with six temperaments, especially the Long-Mei Bell,which is the core of the entire set of chime bells,the question of what the function of the numerous altered sounds is and how to modulate with six temperaments remains to be explored.Starting from the relationship between nominal and real terms of the altered sounds,the article argues that this set of bells not only has altered sounds in the twelve-sound but also possesses the name of a set of altered sounds belonging to oneself.These altered sounds are designed to replace the pentatone on the adjacent temperament,so on the surface,it only has six temperaments and their respective twelve-sound, but it actually has twelve-temperament of the“explicit six and implicit six”along with their respective pentatone and uses the method of cyclic modulation of eight notes apart in them.The disclosure of such a result is proved for the first time from the perspective of the six temperaments of the Long-Mei Bell inscriptions that China had indeed made significant musical achievements in the production of instruments for playing pentatonic music on the twelve- temperament and the theory of the twelve-temperament cyclic modulation in the 5th century BC.