degressionn.
英 dɪ'ɡreʃən | 美
中文n. （税率的）递减；下降；渐减
词根词源
degression (n.)late 15c., from Latin degressionem (nominative degressio) "a going down," noun of action from past participle stem of degredi "to go down, march down, descend," from de- "down" (see de-) + gradus "step" (see grade (n.)).
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