资料来源 : pyDict

详细的说明,铺陈,详述

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

Expatiation \Ex*pa`ti*a"tion\, n.
   Act of expatiating.

资料来源 : WordNet®

expatiation
     n : a discussion (spoken or written) that enlarges on a topic or
         theme at length or in detail