Ancient rhyme parts about the Zhou part and a set of phonogram with the same phonetic element of Zhou reflect a truth:the theory that the phonetic characters with the same consonant certainly belong to the same rhyme part is not the rule that Duan Yucai applied to assign the ancient rhyme parts of phonogram in Shuowen Jiezi. This theory was proposed from the respects of embryology that the phonetic characters with the same consonant cer-tainly belong to the same rhyme part. The rule of phonogram - formation is used to determine the pronunciation of phonetic characters when they were created. Such is a truth only in the same districts of dialect and at the time of phonogram being created.%段玉裁对谐声偏旁“周”及“周”声字的古音归部处理说明,《说文》形声字的古音归部原则并非“同谐声者必同部”,而是另有其他。“谐声同部”理论是从发生学角度提出的谐声造字原则,用来确定谐声造字之初形声字之读音。“同谐声者必同部”只有在一定方言区域内、谐声造字之初才成立。
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