《磧砂藏》隨函音義止蟹二攝的三四等字已經合流,合口一等字正處在向三四等字合流的過程中,上去聲的進程快於平聲。這爽宋詞用韻一致,與宋代通語相符。儘管三四等字已經合流,但同攝韻之間的混切多於異攝韻,《廣韻》同用韻之間的混切多於非同用韻,這與兩攝合流的歷程一致,是語音歷時演變在共時層面的反映。 “Moraine sand reservoir” with the letter meaning crab second photo of the three or four other words have been merging, coveting the first word is in the process of merging the words of the third and fourth, the process of going up faster than usual. This Shuang Song words consistent with rhyming, consistent with the Song language. Although the words of March 4 have been combined, the confusion between them is more than that of different photographic rhyme. , Is a reflection of diachronic evolution at the synchronic level.