周期性

1. 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.
2. （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 * ；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.
3. 新菌系的细菌周期性地产生
   New strains of viruses appear periodically.
4. （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.

周期的英语翻译：

性的英语翻译：