ris·i·bil·i·ty /ˌrɪzəˈbɪləti/
  愛笑的性質,愛笑的癖性,對笑的感受性
  Ris·i·bil·i·ty n.  The quality of being risible; as, risibility is peculiar to the human species.
     A strong and obvious disposition to risibility.   --Sir W. Scott.
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  risibility
       n : a disposition to laugh