Ancient Chinese literature contains a large number of rare characters collected in large dictionaries of different dynasties,including those of unknown sound and meanings,doubtful forms, sound and meanings,and those undocumented or unvalidated in previous classics period.Also there are those standard charaters found in the classics that are elusive in meaning.A detailed study of these Chinese common words is of great importance in improving the compilation of large dictionaries and collation and systemization of Chinese classics.%我们所说的疑难字，包括历代大型字典收录的音、义不详或形音义可疑的汉字，历代大型字典收录的没有任何书证或例证而可用传世文献补证的汉字，历代大型字典未收录的正体不易知晓的传世文献中的汉字。研究这些文字对于汉语俗文字研究、大型字典的完善、传世文献的校勘整理都具有重要的意义。文章选取了28个疑难字进行考释。
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