1
in oestrus
oestrus 在此为不可数名词。
The female is in oestrus for about 24 hours.
雌性发情期大约持续24小时。
发情; 发情周期
oestri — plural of oestrus
先理解核心含义，再看它在真实句子里的用法。
发情; 发情周期
the period of sexual receptivity in female mammals; heat
The female is in oestrus for about 24 hours.
雌性发情期大约持续24小时。
一种属于蝇属的咬人蝇；一种蝇蛆。
A biting fly of the genus Oestrus; a botfly.
叮咬或刺痛。
A bite or sting.
雌性动物的发情期。
A female animal's readiness to mate.
The female dog's oestrus typically lasts about three weeks.
母狗的发情期通常持续约三周。
Farmers monitor their cows for signs of oestrus to optimize breeding.
农民监测母牛的发情迹象以优化繁殖。
The oestrus cycle in sheep averages 17 days.
绵羊的发情周期平均为17天。
oestrus 在此为不可数名词。
The female is in oestrus for about 24 hours.
雌性发情期大约持续24小时。
During oestrus, the female releases pheromones.
发情期间，雌性释放信息素。
此处 Oestrus 为属名，可数，首字母大写。
Oestrus ovis is a parasite of sheep.
羊狂蝇是羊的一种寄生虫。
Not this
The cat is in an oestrus.
Use this
The cat is in oestrus.
Oestrus作“发情期”解时是不可数名词，不能加不定冠词an。
Not this
She is studying the oestrus cycle.
Use this
She is studying the oestrous cycle.
Oestrus是名词，其形容词形式为oestrous，表示“发情的”或“与发情有关的”。
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通常为不可数名词，表示发情期；表示狂蝇属时为可数
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.