1. Friends visit them occasionally.
    朋友偶尔拜访他们。

2. occasionally

2. We go for walks in the fields occasionally.
    我们偶而去田野里散步。

1. 偶尔：尽管在视角方面偶尔(occasionally)会出现一些晃动,但是在一个如此高速移动的忍者动作游戏中,它已经做的足够好了,这点让人印象深刻. 通过试玩这几关的感受,这是一个充满挑战和趣味的游戏,各类敌人都有一些极酷的动作,而且还有英语配音....呃,

2. 不定期：Number of Vehicles 汽车数量 | occasionally 不定期 | Occupation 职业

1. now and then or here and there

    e.g. he was arrogant and occasionally callous
           open areas are only occasionally interrupted by clumps of trees
           they visit New York on occasion
           now and again she would take her favorite book from the shelf and read to us
           as we drove along, the beautiful scenery now and then attracted his attention

    Synonym: on occasiononce in a whilenow and thennow and againat timesfrom time to time