一“物開地牙”見於《説文·竹部》“管”字,其文曰:“管,如篪六孔,十二月之音,物開地牙,故謂之管。從竹官聲。”段玉裁注:“‘物開地牙’四字有脱誤,當作‘物貫地而牙’,‘貫’‘管’同音,‘牙’‘芽’古今字,古書多云十一月物萌,十二月物牙,正月物見也。”桂馥《義證》:“‘物開地牙故謂之管’者,‘開’當作‘貫’,‘管’‘貫’聲相近,凡言‘故謂之’者皆兼聲。”由於“物開地牙”文意不太通順,於是段氏疑此四字有脱誤,把“物開地牙”改作“物貫地而牙”;桂馥亦以爲“開”當是“貫”字誤。他們改訂的根據均是應劭《風俗通義·聲音》,其文 A “open to the teeth ” found in “said the text of bamboo” “tube ” word, the text reads: “tube, such as six holes in Chi, the sound of December, Tube. From the bamboo official sound. ”“ Duan Yu cut: ”open the teeth of the four characters are off error, as ’consistent and tooth’, ’consistent’ tube homophonic, ’tooth’ Bud ’ancient and modern characters, the ancient book cloudy November Meng, December Tooth, the first month of things see also. “Gui Fu” righteousness “: ” As “consistent”, “Guan” consistent “sound close, the words of the so-called” who are both sound. “” Because “open the teeth,” the text is not very smooth, so Duan suspected Four words are off error, the “things open to the teeth ” changed to “materially and the tooth ” Gui Fu also thought “open ” is “consistent ” word error. The basis of their revisions should be based on “custom tongyi voice” and its text