周期性周期出现的性质或状态;以固定的间隔而发生 The quality or state of being periodic; recurrence at regular intervals.
(雌性动物的)动情,动情周期大多数哺乳动物(包括人类)的雌性产生的周期性的性冲动,在此期间内雌性具有排卵的优势,所以该期间最适合性交;刺激 The periodic state of sexual excitement in the female of most mammals, excluding human beings, that immediately precedes ovulation and during which the female is most receptive to mating; heat.
新菌系的细菌周期性地产生 New strains of viruses appear periodically.
(同步电动机的)速度偏差同步电机运行速度的周期性变化 The periodic variation in speed of a synchronous motor with respect to the current.