sliding
 (a.)變化的,可調整的


 Slid·ing a.
 1. That slides or slips; gliding; moving smoothly.
 2. Slippery; elusory. [Obs.]
    That sliding science hath me made so bare.   --Chaucer.
 Sliding friction Mech., the resistance one body meets with in sliding along the surface of another, as distinguished from rolling friction.
 Sliding gunter Naut., a topmast arranged with metallic fittings so as to be hoisted and lowered by means of halyards.
 Sliding keel Naut, a movable keel, similar to a centeboard.
 Sliding pair. Mech. See the Note under Pair, n., 7.
 Sliding rule. Same as Slide rule, under Slide, n.
 Sliding scale. (a) A scale for raising or lowering imposts in proportion to the fall or rise of prices. (b) A variable scale of wages or of prices. (c) A slide rule.
 Sliding ways Naut., the timber guides used in launching a vessel.

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 sliding
      adj : being a smooth continuous motion