degressive
degressive[dɪˈgrɛsɪv]adjective- reducing by gradual amounts
递减的
■(of taxation) at successively lower rates on lower amounts
(税收)税率递减的
语源- early 20th cent.: from Latin degress- 'descended' (from the verb degredi, from de- 'down' + gradi 'walk') + -ive
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