In 'run fast', the adverb 'fast' is a postmodifier.
在run fast中，副词fast是后置修饰词。
The evolutional transformation between the two is unidirectional and permanent. It involves only the transformation from the postmodifier to the premodifier and results in frozen subcategories.
进化性转化具有单向性和恒久性特点，它只由后置修饰语向前置修饰语转化，其结果是产生固化次范畴；
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