然而，在很多非西方社会，一夫一妻制从未占主导地位。
In many non-Western societies, however, monogamy has never dominated.
有一种理论认为，两足动物的进化与核心家庭有关：一夫一妻制的父母合作照顾他们的后代。
One theory is that bipedality evolved in conjunction with the nuclear family: monogamous parents cooperating to care for their offspring.
他们没有证明一夫一妻制会使物种趋向群居。
They do not prove that monogamy predisposes species towards eusociality.
显然哺乳动物的一夫一妻制天性很薄弱。
这便是“附带共同条款的一夫一妻制”。
她全心全意，百分之百的相信一夫一妻制。
She believes, with all her heart, in monogamy - 100% conviction.
而一夫一妻制物种中的雄性则没有出现这种情况。
检测艾滋病病毒，忠贞于婚姻，实行一夫一妻制。
B eing tested for HIV and being faithful in marriage and monogamous relationships.
所以鸟类是一夫一妻制，但它们也背叛，有限度地。
So birds are monogamous but they cheat as well, within limits.
我们对一夫一妻制的理解主要来自鸟类而非哺乳类。
Our understanding of monogamy draws heavily on birds rather than mammals.
蜥蜴界的一夫一妻制很少见，但是这些糙背蜥蜴是例外。
Monogamy is pretty rare among lizards, but these skinks are the exception.
然而它的确是指他不尊重你，如果你赞同一夫一妻制的话。
It does, however, mean he doesn't respect you if you'd agreed to be monogamous.
一夫一妻制对鸟类来说十分普遍，但最出名的要数天鹅了。
Monogamy is surprisingly common for birds, but swans are one of the most famous examples.
当一个男人说他不遵循一夫一妻制的时候，你应该相信他。
When a man says he can't be monogamous, you should believe him.
我知道忠实的非一夫一妻制夫妻，他们有些结婚了不住在一起。
And I know committed nonmonogamous couples, some of whom are married, who don’t live together.
不过社会提倡的是婚姻和一夫一妻制，那么为什么采取行动来改变现状呢？
Society values marriage and monogamy, though, so why isn't it doing anything about it?
一夫一妻制不能绝对保证安全，除非你们都检查过身体且HIV都呈阴性。
Monogamous relationships don't guarantee absolute safety unless you've both been tested and are HIV-negative.
在哺乳动物中，它的与众不同之处在于它既是群居性的，也实行一夫一妻制。
What makes it unusual among mammals is that it is both sociable and monogamous.
草原田鼠作为一种社会性生物，它是仅存3%的“一夫一妻制”哺乳动物中的一类。
The prairie vole is a sociable creature, one of the only 3% of mammal species that appear to form monogamous relationships.
一夫一妻制不仅是可能的，而且是必要的。孩子们必须有所依靠；你也必须有所依靠。
Monogamy is a possibility - and a necessity. Kids have got to have something they can rely on. You have got to have something you rely on.
研究发现催产素可以让一夫一妻制关系中的男人在与其他女人第一次邂逅保持距离。
One study found that oxytocin led men in monogamous relationships to keep a greater distance between themselves and an attractive woman during an initial encounter.
根据我们对古代最文明﹑最发达的民族所能作的考察，一夫一妻制的起源就是如此。
This is the origin of monogamy as far as we can trace it back among the most civilized and highly developed people of antiquity.
该鸟为一夫一妻制，雌鸟担任筑巢、孵卵、育雏任务，雄鸟主要担任保卫领域及警戒任务。
The bird is monogamous, the female answers for nest building, hatching and brooding, the male answers for guarding home range and alerting.
这些类似老鼠的生物是哺乳动物中少数（不到5%）有人类一般的一夫一妻制倾向的动物之一。
These mouselike creatures are among the small minority of mammals — less than 5 percent — who share humans’ propensity for monogamy.
这些类似老鼠的生物是哺乳动物中少数(不到5%)有人类一般的一夫一妻制倾向的动物之一。
These mouselike creatures are among the small minority of mammals - less than 5 percent - who share humans' propensity for monogamy.
因此，如果你想研究一夫一妻制，法律又不允许你拿人类的爱情生活做实验时，你就可以找田鼠。
So if you want to study monogamy - and the government won't let you manipulate human love lives - you play God with the voles.
因此，如果你想研究一夫一妻制，法律又不允许你拿人类的爱情生活做实验时，你就可以找田鼠。
So if you want to study monogamy - and the government won't let you manipulate human love lives - you play God with the voles.
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