periodically
adv. 周期性地；定期地
近义词：sometimes，sporadically，everysooften，occasionally，attimes，onceinawhile，fromtimetotime，intermittently，atregularintervals，regularly，likeclockwork，cyclically，seasonally，continually，
英英释义
Adverb
- in a sporadic manner;
"he only works sporadically"
例句
用作副词(adv.)
- New strains of viruses appear periodically.新菌系的细菌周期性地产生。
- The state of knowledge in this field has been surveyed periodically in review papers.在一些评论文中对这一领域的动态周期性地进行了评述。
- Periodically, someone comes by with a truck to fill them.有些人定期地用卡车运输食品，装进机器。
- Drones must return periodically to recharge their weapons and propulsion systems.雄蜂一定定期地回复再休整他们的武器和推进系统。