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定期地，偶尔
now and then or from time to time
- The professor periodically updates the syllabus, adding new readings when relevant research emerges.
教授定期更新教学大纲，在相关研究出现时添加新的阅读材料。
- The antique clock chimes periodically.
古董钟定期鸣响。
- He periodically volunteers at the food bank.
他定期在食品银行做志愿者。
- The patient's symptoms flare up periodically, making long-term treatment challenging.
患者的症状周期性发作，使得长期治疗具有挑战性。
- She periodically glances at her phone during dinner.
她吃饭时时不时地看手机。