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

Extemporal \Ex*tem"po*ral\, a. [L. extemporalis, from ex
   tempore.]
   Extemporaneous; unpremeditated. [Obs.] --B. Jonson. --
   {Ex*tem"po*ral*ly}, adv. [Obs.]