这些等级较低的妻子与地位较高的妻子或一夫一妻制家庭的妻子相比，生的女孩更多。
These low-ranking wives have relatively more daughters than higher-ranking and monogamously married wives.
孔子的“孝道”，不仅是宗法社会制度的反映，也是一夫一妻制家庭中父母与子女血缘关系的反映。
Confucius' filial piety was the reflection of both the patriarchal clan social system and the blood tie between parents and children in monogamous families.
发表在《生物书简》的研究结果显示：正如预料的那样，与地位更高的妻子和一夫一妻制家庭的妻子相比较，地位较低的妻子生的女孩更多。
And as expected these women produced more daughters than higher-ranking and monogamous wives, according to the findings published in Biology Letters.
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