mutability
  易變性,性情不定
  mu·ta·bil·i·ty /ˌmjutəˈbɪlətɪ/ 名詞
  可突變性
  Mu·ta·bil·i·ty n.  The quality of being mutable, or subject to change or alteration, either in form, state, or essential character; susceptibility of change; changeableness; inconstancy; variation.
     Plato confessed that the heavens and the frame of the world are corporeal, and therefore subject to mutability.   --Stillingfleet.
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  mutability
       n : the quality of being capable of mutation [syn: mutableness]
           [ant: immutability, immutability]