1850, "frenzied passion," from Latin oestrus "frenzy, gadfly," from Greek oistros "gadfly; breeze; sting; anything which makes one mad, mad impulse," perhaps from a PIE *eis- (1), forming words denoting passion (see ire). First attested 1890 with specific meaning "rut in animals, sexual heat." Earliest use in English (1690s) was for "a gadfly." Related: Estrous (1900).
实用例句
1. The next estrus was delayed.
下一次发情推迟了.
来自《现代汉英综合大词典》
2. A cow's estrus cycle averages 21 days.
母牛的发情周期平均为21天.
来自辞典例句
3. 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.
来自辞典例句
4. In cows and many other animals, the female is in estrus just before ovulation.
母牛和许多其他的雌性动物都正好是在排卵前发情.
来自辞典例句
5. During estrus, the female is fertile and will accept a male.
