詞性變化如下

動詞long，渴望。longing名詞。longing形容詞。length ，名詞，lengthy，adj. 漫長的，長時間的；（講話、文章等）冗長的，過于詳盡的，動詞，lengthen，vt. 使延長；加長

例如

Conventional wisdom would seem to suggest that companies have no incentive to lengthen the life cycle of their products and reduce the revenue they would get from selling new goods.