from time to time时常，有时，不时from time to time是 time 的常见短语，是一个表示频度的介词短语，其频度和 at times， sometimes ，now and then是同意表达，都表示“有时”的意思。from time to time=sometimes=at times=now and then 频度比较always>usually>often>from time to time>occasionally>seldom>hardly例句：1. She sat silently,flinging the odd word into the conversation from time to time. 她静静地坐着听谈话，不时插进一两句。2. He threw in a word or two from time to time. 他时不时冒出一两句话。
