becoming or making something less advanced 退化的;倒退的;退步的 - (specialist)
(of taxes )税收 having less effect on the rich than on the poor 递减的(对富人的影响比对穷人的小) A regressive tax structure is one in which the average tax rate falls as income level rises. 累退税结构是一种平均税率随着收入水平的提高而下降的结构。