pacing
  定步; 步測
  pac·ing /ˈpesɪŋ/ 名詞
  進度,速度,起搏
  pacing
  調步;定步
  pacing
  定步
  Pace v. i. [imp. & p. p. Paced p. pr. & vb. n. Pacing ]
  1. To go; to walk; specifically, to move with regular or measured steps. “I paced on slowly.” --Pope. “With speed so pace.” --Shak.
  2. To proceed; to pass on. [Obs.]
     Or [ere] that I further in this tale pace.   --Chaucer.
  3. To move quickly by lifting the legs on the same side together, as a horse; to amble with rapidity; to rack.
  4. To pass away; to die. [Obs.]
  pacing
       n 1: (music) the speed at which a composition is to be played
            [syn: tempo]
       2: walking with slow regular strides