有发情期特征的

例句：

1. 1. The female mammal is in the estrus phase, which means she is ready to mate.
   雌性哺乳动物处于发情期，意味着她准备好交配。
2. 2. During the estrus period, the female deer will often graze on the grass and display signs of mating behavior.
   在发情期，雌鹿会经常吃草并表现出交配行为的迹象。
3. 3. Estrus is a critical period for breeding in many species, where females are more likely to matewith males during this time.
   发情期是许多物种繁殖的关键时期，在此期间，雌性更有可能与雄性交配。