compressibility
  壓縮的可能性,壓縮性,壓縮率
  Com·press·i·bil·i·ty n.  The quality of being compressible of being compressible; as, the compressibility of elastic fluids.
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  compressibility
       n : the property of being able to occupy less space [syn: squeezability,
            sponginess] [ant: incompressibility]