ex·trap·o·late /ɪkˈstræpəˌlet/
  (vt.)(vi.)推斷,外推
  extrapolate
  外推
  extrapolate
       v 1: draw from specific cases for more general cases [syn: generalize,
             generalise, infer]
       2: estimate the value of [syn: interpolate]
       3: gain knowledge of (an area not known or experienced) by
          extrapolating