concubinage的音標是[k?n?s?b?n?d?]，意思是“妾媵制度；姘居”。速記技巧是：con-（共同）+cub-（孩子）+-in-（詞根）→共同養孩子→姘居。

concubinage這個詞源于拉丁語，意為“妻子之外的伴侶關系”。它的變化形式包括名詞形式concubine（姘婦）和動詞形式concubitate（姘居）。

相關單詞：

concubine這個詞可以指代妾、姘婦、情婦等，例如歷史上的楊貴妃就被稱為壽王妃，也就是唐玄宗的姘婦。

concubinage這個詞則可以指代這種關系本身，即非正式的婚姻關系或姘居關系。

concubitear這個單詞是俚語，指的是姘頭或情婦，這個詞的使用頻率不高。

此外，這個詞在英語中還衍生出了其他一些相關單詞，例如：

concubineless（無妾的）

concubinehood（妾的地位）

concubinity（妾的身份）

concubinize（姘居）

concubinizeless（無妾的）

總之，concubinage這個詞在英語中具有豐富的含義和用法，它反映了古代社會中非正式婚姻關系和妾的地位。

常用短語：

1. concubinage relationship

2. live in concubinage

3. have concubines

4. be in concubinage

5. engage in concubinage

6. under the shadow of concubinage

7. be suspected of concubinage

例句：

1. They were suspected of living in concubinage after the divorce.

2. He had several concubines and lived a luxurious life.

3. She was caught in the shadow of her father"s concubinage and suffered a lot.

4. They were both suspected of engaging in concubinage and had to separate.

5. She was forced to leave her home because of her mother"s concubinage.

6. He was accused of having a concubine and was punished severely.

7. She was raised in a family where her mother was suspected of living in concubinage, which had a profound impact on her life.

英文小作文：

Title: The Impact of Concubinage in History

Concubinage has played a significant role in history, affecting the lives of many individuals and families throughout the ages. From royalty to commoners, concubinage has been a common practice that has shaped the social, cultural, and political landscape. However, it has also brought about controversy and condemnation, with many people arguing that it was a form of exploitation and inequality.

Concubinage allowed men to have multiple sexual partners, often with women who were not their legal spouse. This practice created conflict and instability within families, as well as social unrest and tension between different groups. It also led to the marginalization and exploitation of women, who were often treated as mere objects rather than individuals with their own rights and dignity.

On the other hand, some people argue that concubinage provided women with an opportunity to rise above their social status and gain more independence and power. However, this perspective does not take into account the negative effects of concubinage on women, such as being forced into sexual relationships against their will or being treated as second-class citizens.

In conclusion, concubinage has had a profound impact on history and society, with both positive and negative aspects. It is important to recognize the impact of this practice on individuals and families, while also considering its historical context and social environment.