once e in a while偶尔;时不时地
every once in a while有时;偶然;偶尔;时而
evry once in a while间或
once in a while b时而;有时
once in a while Farther表程度的副词类
only once in a while只是偶尔
同义词:occasionallyon occasionnow and thennow and againat timesfrom time to time