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]