miscalculate
  (vt.)誤算(vi.)算錯
  Mis·cal·cu·late v. t. & i.
  1. To calculate erroneously.
  2. To judge wrongly, especially about the effects of action or the likely course of events.
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  miscalculate
       v 1: judge incorrectly; "I had misestimated his determination"
            [syn: misestimate]
       2: calculate incorrectly; "I miscalculated the number of guests
          at the wedding" [syn: misestimate]