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 |