sprightliness
  愉快,快活
  Spright·li·ness n. The quality or state of being sprightly; liveliness; life; briskness; vigor; activity; gayety; vivacity.
     In dreams, observe with what a sprightliness and alacrity does she [the soul] exert herself!   --Addison.
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  sprightliness
       n : animation and energy in action or expression; "it was a
           heavy play and the actors tried in vain to give life to
           it" [syn: liveliness, life, spirit]