intermittent fractionation

例句：

1. 1. The patient's condition improved intermittently throughout the day.
   病人的状况在一天中断断续续地有所改善。
2. 2.The rain was intermittently heavy and light.
   雨时而大雨，时而小雨。
3. 3. The process is intermittent, meaning it occurs at irregular intervals.
   这个过程是间歇性的，意味着它以不规则的间隔发生。