从进化的角度来讲，单配制有利于雌性，而对雄性却不然。
FROM an evolutionary perspective, monogamy looks good for females and bad for males.
但是现代遗传学技术表明，许多物种的雌性很明显是处于一种单配关系中，但所生育的后代却有着不止一个父亲。
But modern genetic techniques have shown that in many species females in apparently monogamous relationships often produce families that have more than one father.
那些草原上的单配的田鼠，它也只会一身只绑定一个雌性，即使它被放置与其它能生育的雌性田鼠一起。
The prairie vole, which is monogamous, bonds with one female for life, even if he's presented with other, fertile females.
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