periodic state的用法和樣例：
例句
- 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.
(雌性動物的)動情，動情周期大多數哺乳動物(包括人類)的雌性產生的周期性的性沖動，在此期間內雌性具有排卵的優勢，所以該期間最適合性交; 刺激
