oc·cur·rence /əˈkɝən(t)s, ˈkʌrən(t)s/
  U發生,出現;C事件,發生的事情
  occurrence
  事件; 發生; 出現; ( 資料庫中的 )具體值
  occurrence
  出現
  Oc·cur·rence n.
  1. A coming or happening; as, the occurrence of a railway collision.
     Voyages detain the mind by the perpetual occurrence and expectation of something new.   --I. Watts.
  2. Any event or incident; esp., one which happens without being designed or expected; as, an unusual occurrence, or the ordinary occurrences of life.
     All the occurrence of my fortune.   --Shak.
  Syn: -- See Event.
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  occurrence
       n 1: an event that happens [syn: happening, natural event]
       2: an instance of something occurring; "a disease of frequent
          occurrence"; "the occurrence (or presence) of life on
          other planets"