intermittent failure

例句：

1. 1. The patient's condition improved intermittently during the treatment.
   在治疗期间，患者的病情时好时坏。
2. 2. The light flickered intermittently as the power went out.
   停电时，灯光闪烁不定。
3. 3. The work was interrupted by intermittent phone calls from her boss.
   她的老板时不时地打来电话打断了她的工作。