“薄”一般被认为是一个表微度的副词,笔者却发现在中古文献中“薄”可以充当甚度副词。并认为这种强程度性质可能与当时微度副词系统向甚度副词系统发展的语法类推有关。这一发现对汉语史研究有一定意义。 Thin is generally considered to be an adverb of micromorphism, but the author finds that in ancient literature the thin can serve as an adverb of vantage. And thinks that this strong degree may be related to the grammatical analogy developed by the micro-adverbs system to the Vulnerability Adverbs system. This discovery has certain significance to the study of Chinese history.