periodically

英文解釋：

副詞 periodically:

1. in a sporadic manner
   同義詞：sporadically

英文造句：

1. A device that periodically and automatically opens and closes an electric circuit, producing pulses.
   斷續器一種階段性的能自動打開及關閉電路並產生脈衝的儀器
2. New strains of viruses appear periodically.
   新菌系的細菌周期性地產生