infrequently
  (ad.)稀少地;珍貴地
  In·fre·quent·ly adv. Not frequently; rarely.
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  infrequently
       adv : not many times; "in your 1850 church you not infrequently
             find a dramatic contrast between the sumptuous
             appointments of the building itself and the inhuman
             barrack-like living conditions in the church room"
             [ant: frequently]