periodicities
[.piəriə'disiti]
[ periodicities ]
n.周期性, 周期数
例句与用法:
A device that periodically and automatically opens and closes an electric circuit, producing pulses.
断续器一种阶段性的能自动打开及关闭电路并产生脉冲的仪器
New strains of viruses appear periodically.
新菌系的细菌周期性地产生。
词形变化:
名词复数: periodicities |