periodicityn.周期性；周期数periodicadj.周期的；定期的；间歇的；完句的periodicity/frequency周期/频率periodic rotating orbits周期性绕飞轨道periodic initial problem周期初值问题Periodic interval system周期区间系统periodic and burst model周期性突发模型periodic-pulse voltage周期脉冲电压Periodic signal spectrum周期信号频谱Periodic Evaluation Test定期鉴定试验periodic crystallisation反复结晶periodic reverse current周期反向电流

1. Silicon is one of the most studied elements in the periodic table.
   硅是周期表中最熟悉的元素之一。
2. We can elaborate the electronic configuration for the atoms in the periodic chart.
   我们能够精心安排周期表中原子的电子排布。