(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.
妇女排卵期不正常就不易受孕。
Women who do not ovulate regularly have difficulty in becoming pregnant.