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.
富裕国家的人重视一夫一妻制，并倾向于不经常出轨。
People in rich countries value monogamy and tend not to stray often.
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.
很多人显然对一夫一妻制存在着误解。
There are apparently some misconceptions about this whole monogamy thing.
显然哺乳动物的一夫一妻制天性很薄弱。
专业人士阶层最支持一夫一妻制。
Support for monogamy and marriage was strongest among the professional classes.
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.
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.
一夫一妻制不仅是可能的，而且是必要的。
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.
对他们来说，一夫一妻制既不新颖也不陌生。
你可曾听说乔治·贝斯特赞成一夫一妻制吗？
而一夫一妻制物种中的雄性则没有出现这种情况。
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.
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.
有些男人喜欢一夫一妻制有些则不喜欢，这一点你越早发现越好。
Some men like being in a monogamous relationship and some don't.
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.
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.
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.
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