twittering
  呢喃
  Twit·ter·ing, n.
  1. The act of one who, or that which, twitters.
  2. A slight nervous excitement or agitation, such as is caused by desire, expectation, or suspense.
     A widow, who had a twittering towards a second husband, took a gossiping companion to manage the job.   --L'Estrange.
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  Twit·ter, v. i. [imp. & p. p. Twittered p. pr. & vb. n. Twittering.]
  1. To make a succession of small, tremulous, intermitted noises.
     The swallow twittering from the straw-built shed.   --Gray.
  2. To make the sound of a half-suppressed laugh; to titter; to giggle.
  3.  To have a slight trembling of the nerves; to be excited or agitated.