estrous的音標是["?str??s]，基本意思是“發情的，情熱的”。

速記技巧：可以嘗試使用音標記音，或者結合單詞的拼寫和發音規則來記憶。

Estrous, 源于拉丁語，意為“月經期”。其變化形式包括 estrous cycle（發情周期）、estrus（發情期）、proestrus（間情期）等。

相關單詞：

1. Ovulation（排卵）：排卵是月經周期中的一環，通常在排卵期間，雌性動物會表現出強烈的交配欲望。

2. Menstruation（月經）：月經是女性特有的生理現象，每月一次，通常在排卵后約一周開始，持續約3-7天。

3. Pregnancy（懷孕）：當雌性動物受孕時，其發情周期會發生變化，停止排卵并開始為孕育胎兒做準備。

4. Luteinization（黃體化）：在月經周期的后期，排卵后的卵泡會轉化為黃體，黃體化是這一過程的一部分。

5. Estrus hormone（雌激素）：雌激素是一種重要的荷爾蒙，在發情期和月經周期中起關鍵作用，刺激生殖器官的發育和功能。

這些詞都與生殖和月經周期有關，是生物學和醫學領域的重要概念。它們的理解和使用對于理解人類和動物生殖生理過程至關重要。

常用短語：

1. in heat

2. estrus cycle

3. heat cycle

4. heat stress

5. heat exhaustion

6. heatstroke

7. ovulation

雙語例句：

1. She is in heat and is restless and irritable.

2. She is going through the estrus cycle and her behavior has changed.

3. The heat cycle can be very tiring and requires plenty of water and rest.

4. Heat exhaustion and heatstroke are serious health problems that require immediate medical attention.

5. Ovulation is the process by which an egg is released from the ovary and can lead to pregnancy if intercourse occurs at the right time.

英文小作文：

The Estrous Cycle: A Key Part of Animal Life

The estrus cycle is a crucial aspect of the life cycle of many animals, including humans. It is a time when female animals become fertile and are most likely to conceive, while males become more interested in mating. This cycle is marked by changes in behavior, body temperature, and other physical characteristics, making it easy to identify when a female is in heat. Understanding the estrus cycle and when it occurs is essential for maintaining healthy relationships between animals and ensuring the survival of the species.