retentiveness
  保持力;好記性
  Re·ten·tive·ness, n. The quality of being retentive.
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  retentiveness
       n 1: the power of retaining and recalling past experience; "he
            had a good memory when he was younger" [syn: memory, retention]
       2: the property of retaining possessions that have been
          acquired
       3: the power of retaining liquid; "moisture retentivity of
          soil" [syn: retentivity, retention]