occasionally

ad.偶尔地,间或

obtain, obtainable, obtrude, obtrusion, obtrusive, obtrusive-ness, obtrusively, obtuse, obtuse angle, obtusely, obtuseness, obverse, obviate, obvious, obviously, obviousness, ocarina, occasion, occasional, occasional table, Occident, Occidental, occlude, occult, occultist, occupancy, occupant, occupation, occupational, occupied, occupier, occupy, occur, occur to, occurrence, ocean, ocean lane, ocean-going, oceanarium, Oceania,