衍文 拼音：yǎn wén词义：因缮写、刻版、排版等错误而多出来的字或句子。多出来的字或词认为这些字在这里使得意思不通，应该是在刊行的过程中有失误或是有人故意加上去的。
具体而言，有改正误文、乙正倒文、增补脱文、删除衍文、保存异文等作用。
Such as correcting mistakes of texts, putting right the reversal words, supplementing the missing words, deleting the unwanted words, saving the different words and etc.
为了保证这部著作的质量，编者对文章中的脱字、漏字以及衍文进行了必要的校正。
The complier of it has revised the missing words, carets, and derivatives in order to maintain its quality.
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