var·i·ate /ˈvɛriˌet, ˈvær, ət/
  看Random Variable.散亂變數
  Va·ri·ate v. t. & i.  To alter; to make different; to vary.
  ◄ ►
  variate
       n : a variable quantity that is random [syn: random variable,
           variant, stochastic variable, chance variable]