pal·in·drome /ˈpælənˌdrom/
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  pal·in·drome /ˈpælənˌdrom/ 名詞
  回文序列,回文結構,旋轉對稱
  palindrome
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  Pal·in·drome n.  A word, verse, or sentence, that is the same when read backward or forward; as, madam; Hannah; or Lewd did I live, & evil I did dwel.
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  palindrome
       n : a word or phrase that reads the same backward as forward