rule out
  拒絕考慮,把…排除在外,使成為不可能
  rule out
       v 1: make impossible, especially beforehand [syn: preclude, close
            out]
       2: include or exclude by determining judicially or in agreement
          with rules [syn: rule in]
       3: dismiss from consideration; "John was ruled out as a
          possible suspect because he had a strong alibi"; "This
          possibility can be eliminated from our consideration"
          [syn: eliminate, reject]