宋刻《集韵》 “都感切”即取都的声母和感的韵母，转换成现代汉语拼音就是“dǎn”。 dǎn这个读音来源不详，它有可能源自于“丹”的异体字“☒”（此字知乎显示不出来，暂用“☒”代替，详见 “ ”字的.
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Dalbo
