单词：occasionally 

副词

• 
  [1.r.occasionally] (同义词:[occasionally( adv. 有时候, 偶而 )]  [on_occasion(adv.有时  有时  遇必要时 )]  [once_in_a_while(adv.偶尔 )]  [now_and_then(adv.偶尔 )]  [now_and_again(adv.不时 )]  [at_times(adv.有时, 不时 )]  [from_time_to_time(adv.有时 )]  )
• 
  注释列句：now and then or here and there; "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"
• 属于名词 -> [occasional( adj. 偶然的, 非经常的, 特殊场合的, 临时的 )]