n.动情期，动情周期，发情
Anestrus ( absence of estrus ) is not a disease but a sign of a variety of conditions.
乏情不是一种疾病,而是一种多方面的体态迹象.
The next estrus was delayed.
下一次发情推迟了.
A cow's estrus cycle averages 21 days.
母牛的发情周期平均为21天.
汉字吧hanzi8.com