The quality or state of being periodic; recurrence at regular intervals. 周期性周期出現的性質(zhì)或狀態(tài); 以固定的間隔而發(fā)生
If we look at a cross section of a water wave, we may see that the wave form repeats itself at regular intervals. 如果我們觀(guān)察水波的橫截面，我們會(huì )看到波形是按一定的間隔重復的。
A publication issued at regular intervals of more than one day. 期刊以多于一天的周期定期出版的出版物
He comes back to see us at regular intervals. 他每隔一段時(shí)間就回來(lái)看看我們。
