You use at times to say that something happens or is true on some occasions or at some moments.
If you do something from time to time, you do it occasionally but not regularly.
2. 我们以前讲过几个和time有关的易混词组,at times,at a time,at one time和at the time。大家还记得如何区分吗?
at times指“有时,不时”,如“She is annoying at times.”,她有时候很烦人;
at a time作“一次,每次”讲时常用于“数词+at a time”结构中,比如“Take two pills at a time.”,一次吃两颗药;
at one time指“一度,曾经”;
at the time则指“那时”,比如“She was still with him at the time.”,那时他们还在一起。