ret·ro·spec·tion /ˌrɛtrəˈspɛkʃən/
  回顧,追憶,考慮
  Re·tro·spec·tion n. The act, or the faculty, of looking back on things past.
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  retrospection
       n 1: reference to things past; "the story begins with no
            introductory retrospections"
       2: memory for experiences that are past; "some psychologists
          tried to contrast retrospection and introspection"