alterable
  可變
  Al·ter·a·ble a.  Capable of being altered.
     Our condition in this world is mutable and uncertain, alterable by a thousand accidents.   --Rogers.
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  alterable
       adj 1: capable of being changed or altered in some characteristic;
              "alterable clothing"; "alterable conditions of
              employment" [ant: unalterable]
       2: of a sentence; capable of being changed to one less severe