1、有时
...evry once in a while 间或every once in a while 有时 ; 偶然 ; 偶尔 ; 时而once in a while Farther 表程度的副词类 ...
2、偶然
... at times有时，不时 every once in a while偶然 every now and then有时;时时 ...
3、偶尔
... Much better than：远优于；比……好得多；胜过 Let one's hair down：把头发放下；不拘礼节；不要有顾忌 Every once in a while：偶尔；间或 ...
4、时而
...evry once in a while 间或every once in a while 有时 ; 偶然 ; 偶尔 ; 时而once in a while Farther 表程度的副词类 ...