af·ter·thought /-ˌθɔt/
 事後才有的想法,追悔,再思


 Aft·er·thought n.
 1. Reflection after an act; later or subsequent thought.

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 afterthought
      n 1: thinking again about a choice previously made; "he had
           second thoughts about his purchase" [syn: reconsideration,
            second thought, rethink]
      2: an addition that was not included in the original plan; "the
         garage was an afterthought"