slide-rule

n ruler with a strip sliding in a groove in the middle, marked with logarithmic scales for making rapid calculations 滑尺; 计算尺.

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