anestrus

During the winter, many wild animals enter a period of anestrus to conserve energy.

用法提示：anestrus 作为不可数名词，表示动物在繁殖季节之间的无性活动期。

The vet explained that the dog is in anestrus and will not be receptive to mating for several months.

用法提示：anestrus 与介词 in 搭配，表示处于该状态。

Unlike humans, most mammals have a distinct anestrus phase between breeding cycles.

用法提示：anestrus 用作名词，修饰phase，指代一个生理阶段。