n.期刊,杂志
adj.周期的,定期的,时常发生的,定期发行的,期刊的
The quarterly magazine is a periodical published every three months.
季刊是每3个月出版一次的期刊.
They have already put out a new periodical.
他们已经出版了一种新的期刊.
She made periodical visits to her dentist.
她定期去看牙医。