sporadic case

例句：

1. 1. The weather is sporadic, with rain and sunshine alternating every few days.
   天气是不规则的，每隔几天就下雨和晴天交替。
2. 2.The project has been sporadic in its progress, with only a few tasks completed each month.
   这个项目进展很不稳定，每个月只完成几个任务。
3. 3. The company's revenue is sporadic, fluctuating between good and bad times.
   公司的营收不稳定，好的时候和坏的时候都有波动。