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
In brief, mammals are warm-blooded, lung-breathing, hairy vertebrates.
简言之，哺乳动物是温血、肺呼吸和多毛的脊椎动物。
A corresponding organ in other mammals.
胸脯其它哺乳动物的相应器官
