rep·ar·tee /ˌrɛpɚ/
  機敏的應答
  Rep·ar·tee n.  A smart, ready, and witty reply.
  Cupid was as bad as he;
  Hear but the youngster's repartee.   --Prior.
  Syn: -- Retort; reply. See Retort.
  Rep·ar·tee, v. i. [imp. & p. p. Reparteed p. pr. & vb. n. Reparteeing.] To make smart and witty replies. [R.]
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  repartee
       n : adroitness and cleverness in reply