If we assume animal pairs are always monogamous, or always philandering, we might not figure out why some species are faithful to their mates and others have multiple partners.
如果我们认为动物夫妻是一夫一妻的，或者常常打情骂俏的，那么我们就不会注意到有些动物更忠于它们的同伴，而另一些有多个合作伙伴。
If we assume animal pairs are always monogamous, or always philandering, we might not figure out why some species are faithful to their mates and others have multiple partners.
如果我们认为动物夫妻是一夫一妻的，或者常常打情骂俏的，那么我们就不会注意到有些动物更忠于它们的同伴，而另一些有多个合作伙伴。
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