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
oestruses — plural of oestrus
狂蝇属；一种属于蝇属的咬人蝇；一种蝇蛆。；叮咬或刺痛。；雌性动物的发情期。
the period of sexual receptivity in female mammals; heat
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。
用法提示：名词作主语，表示发情期。
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。
用法提示：名词作介词宾语，表示发情状态。
The oestrus cycle in sheep averages 17 days.
绵羊的发情周期平均为17天。
用法提示：名词作定语，构成复合名词表示发情周期。
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。
grammar · medium
易错句子The cat is in an oestrus.
正确表达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。
grammar · medium
易错句子She is studying the oestrus cycle.
正确表达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”。
oestrus为英式拼写，estrus为美式拼写，意义完全相同，但拼写不同。
oestrus为名词，estrous为形容词，词性不同，不能互换。
oestrus指发情状态或周期，estrogen指雌性激素，概念不同。
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