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）

sleet, sleeve, sleeveless, sleigh, sleight, slender, slenderly, slenderness, slept, sleuth, slew, slew (US also slue), slice, slick, slicker, slide, slide into, slide over, slide-rule, sliding door, slight, slightingly, slightly, slightness, slim, slime, sliminess, slimly, slimmer, slimness, slimy, sling, sling-shot, slink, slinkiness, slinky, slip, slip-case, slip-cover, slip-knot,