stro·bo·scope /ˈstrobəˌskop/
  光測頻器;閃光燈
  Strob·o·scope n.
  1. An instrument for studying or observing the successive phases of a periodic or varying motion by means of light which is periodically interrupted.
  2. An optical toy similar to the phenakistoscope. See Phenakistoscope.
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  stroboscope
       n : scientific instrument that provides a flashing light
           synchronized with the periodic movement of an object; can
           make moving object appear stationary [syn: strobe, strobe
           light]