计算尺, 按比例增减
在线英汉词典

sliding scale的短语、例句：

sliding scale scale that relates two things, so that they each increase or decrease together 滑动费率, 滑动折算制（相关的两项目相应增减制）
Fees are calculated on a sliding scale according to income, ie Richer people pay more. 这种费用是根据收入高低滑动折算的（富人多付钱）