资料来源 : pyDict

即席作成,即席演说,即兴之作

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Extemporization \Ex*tem`po*ri*za"tion\, n.
   The act of extemporizing; the act of doing anything
   extempore.

资料来源 : WordNet®

extemporization
     n : a performance given extempore without planning or
         preparation [syn: {extemporisation}, {improvisation}]