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.
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.
垂体后叶加压素，一种抗利尿激素，又是一种与一夫一妻制的长久关系形成有关的化学物质（见“钟情者只有我们吗？”）
Vasopressin, an antidiuretic hormone, is another chemical that has been associated with the formation of long-term, monogamous relationships (see "Are We Alone in Love?").
和研究人员怀疑的一样，在其他条件相同的情况下，一夫一妻制的家庭育有更多的儿子：平均每生出100个女儿，就会生出101个儿子。
As the researchers suspected, when all other things were equal mothers in monogamous marriages had most sons: 101 for every 100 daughters.
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.
从纯进化论的角度来说，一夫一妻制的人，其基因在下一代中被复制的次数更少。
From a purely evolutionary point of view, the guy who's monogamous will have fewer copies of his genes in the next generation than a guy who's not.
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.
同时它们是一夫一妻制的，父母双方都需要花费大量的时间用来寻找食物，这就使得它们没时间去进行花哨的求爱行为。
They're monogamous, and both parents need to spend most of their time foraging. This means less time for elaborate courtship behavior.
显然哺乳动物的一夫一妻制天性很薄弱。
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.
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.
而一夫一妻制物种中的雄性则没有出现这种情况。
孔子的“孝道”，不仅是宗法社会制度的反映，也是一夫一妻制家庭中父母与子女血缘关系的反映。
Confucius' filial piety was the reflection of both the patriarchal clan social system and the blood tie between parents and children in monogamous families.
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.
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.
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.
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.
但没有一个圣托马斯的追随者会因此就不相信终身一夫一妻制，因为真正的信仰的基础并不在于所说的那些理由。
But no follower of Saint Thomas would, on that account, cease to believe in lifelong monogamy, because the real grounds of belief are not those which are alleged.
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.
一夫一妻制不仅是可能的，而且是必要的。
一夫一妻制不仅是可能的，而且是必要的。
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