但是一夫一妻制的家庭又有不同种类。
Within the monogamic family there are, however, many varieties.
不像其他的鱼类，它们是一夫一妻制并终生厮守。
Unlike most other fish, they are monogamous and mate for life.
一夫一妻制不仅是可能的，而且是必要的。
他说他的女儿担心他们被分离开来变成一夫一妻制。
He said his daughter was worried that they might have separated a monogamous couple.
他说他的女儿担心他们被分离开来变成一夫一妻制。
He said his daughter was worried that they might have separated a monogamous couple.
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