n.期刊
adj.定期的
She refereed for a periodical a few years ago. 几年前她为一期刊担任编审。
They have already put out a new periodical. 他们已经出版了一种新的期刊。
I should be glad if you could insert this article into your periodical. 如果能把这篇文章登在你的期刊上我将很高兴。
用作形容词 (adj.)I expect regular periodical reports from you. 我期待你定期汇报。
The worker has a periodical check on the machine. 工人对机器要定期检查。
adv.周期性地；定期地
不定期地
