1. 周期性周期出現(xiàn)的性質(zhì)或狀態(tài)；以固定的間隔而發(fā)生
   The quality or state of being periodic; recurrence at regular intervals.
2. （雌性動(dòng)物的）動(dòng)情，動(dòng)情周期大多數(shù)哺乳動(dòng)物（包括人類）的雌性產(chǎn)生的周期性的性沖動(dòng)，在此期間內(nèi)雌性具有排卵的優(yōu)勢，所以該期間最適合 * ；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. 新菌系的細(xì)菌周期性地產(chǎn)生
   New strains of viruses appear periodically.
4. （同步電動(dòng)機(jī)的）速度偏差同步電機(jī)運(yùn)行速度的周期性變化
   The periodic variation in speed of a synchronous motor with respect to the current.

周期的英語翻譯：

性的英語翻譯：