短語詞組短語graceful degression 工作可靠但性能下降decrement degression 漸減density degression 變密度monotonous degression 單調遞減Discrepancy Degression 差異遞減variety degression 品種退化degression n 遞減degression descending 遞減oilfield degression regularity 油田遞減規(guī)律 返回 degression