For our ancestors, taking risks was a good bet.
对我们的祖先来说，冒险是一桩好赌注。
Big Sheep — The definition of beauty for our ancestors.
我们的先祖对美最初的定位：大羊。
For our ancestors, it was also a thing of magic and mystery.
对我们的祖先而言，它也是充满魔力和神秘的现象。
Yeah. My family is very traditional. We still do that and show respect for our ancestors.
是的，我家是非常传统的。我们仍然以这种方式来表达对祖先的尊敬。
For our ancestors to survive, they had to be good at spotting patterns, such as figuring out when and where they were likely to find wild animals, fish and other food.
我们的祖先为了生存不得不习惯按已有规律行事，从前人的经验了解何时何地能够找到野生动物、鱼类或者其他食物。
"There's this history of a precarious existence not just for our species but for our ancestors," says co-author Lynn Jorde, a human geneticist at the University of Utah in Salt Lake City.
“这段岌岌可危的生存史，不仅关系到我们这个物种，也关系到我们的祖先，”参与研究的Lynn Jorde说道，她是盐湖城犹他大学的人类遗传学家。
For most of our evolutionary history, our ancestors lived in tribes.
在人类进化史的绝大多数时间里，我们的祖先都生活在部落里。
The ape shoulder is good for hanging from a tree, but when our ancestors started walking on two legs, the shoulder started to change.
猿猴的肩膀有利于其在吊在树上，但是当我们的祖先开始以两条腿走路以后，猿猴的肩膀也开始发生变化。
Our ancestors might not play with marbles, but wrinkled fingers could make it easier for them to climb around in the wet forests and catch fish from rivers.
我们的祖先可能不会玩弹珠，但起皱的手指可以让他们更容易在潮湿的森林里爬来爬去和从河里抓鱼。
"I stand here today humbled by the task before us, grateful for the trust you have bestowed, mindful of the sacrifices borne by our ancestors," President Obama began.
奥巴马说：“今天我站在这里，为我们面临的重任而感到渺小，为你们给予我的信任而充满感激，更缅怀我们的祖先所作出的牺牲。”
For a long time, our ancestors had used fire to roast meat but, in the sense that we would use the word today, they were now 'cooking'.
漫漫岁月中，曾几何时，我们祖先们已经学会了取火烧肉。 也许某种意义上，按我们现代人的说法，他们现在会进行“烹饪”了。
Then, for reasons anthropologists debate long into the night, our hominid ancestors stood upright, which was the bodily equivalent of tipping a bridge on end.
然而，由于各种原因，人类学家对此构造的看法存在很多争议。我们的祖先直立背部行走，这就如同拱形桥梁从一头倒塌。
Over the course of evolution, it was rare for our maternal ancestors to be full-time mothers, said Brizendine, because there was always kin-folk around to help with child rearing.
在历史的演化过程中，我们的母性祖先做个全职妈妈是很罕见的，布里曾丹说，因为他们身边总有亲朋好友来帮助养育儿女。
This gave our ancestors the freedom to store food for hard times, travel long distances and live in harsh climates.
这让我们的祖先在困难时期、长途旅行或恶劣气候条件下可以自由保存食品。
When taking into account our ancient ancestors, "humans have engaged in endurance running for millions of years," the researchers wrote in their study.
当把我们远古的祖先考虑在内的时候，“人类的耐久性跑步已经有上百万年的历史了”，研究着在他们的报告中写到。
The puzzle pieces fit together recently for a team of scientists who studied why our closest ancestors stopped walking on all fours.
最近一组科学家，在研究人类最近的祖先为什么开始直立行走时，给出了给出了一副完整的拼图。
But 1.2 million years ago, only 18, 500 early humans were breeding on the planet — evidence that there was a real risk of extinction for our early ancestors, according to a new study.
但120万年前，在这颗星球上繁衍的早期人类只有18500人。新的研究认为，这证明我们早期祖先曾遭受了灭顶之灾。
"We cannot know for certain how fairly our ancestors in foraging bands behaved," but the findings "bring us a closer understanding," she wrote.
“我们不能肯定我们的祖先在觅食团体中的行为多么公平”，但这些发现“使我们能进一步了解，”她写道。
After all, the sentiment behind those poignant words can be traced all the way back to a time when our earliest ancestors did indeed work for food.
毕竟，这些让人痛苦的文字背后的情绪可以追溯到很久很久以前，我们的先祖的确为了食物而工作。
Our ancestors, known to be herbivores, needed strong molars for mashing up and chewing plant material.
我们的祖先是草食动物，因此需要强壮的磨牙来混合和咀嚼植物。
Some types of biotechnology have been around for millennia, and probably began when our ancestors used microorganisms to make bread, wine and cheese.
有些类别的生物技术已存在成千上万年，很可能开始于我们祖先使用微生物来制作面包、葡萄酒和干酪之时。
As people of all cultures and faiths welcome the Year of the Tiger, let us all give thanks for family, the wisdom of our ancestors, and the company of our friends and neighbors.
在不同文化、不同信仰的人们同迎虎年的时刻，让我们感激我们的家人，感恩祖先的智慧，感谢我们的亲朋好友与左邻右舍的相伴。
The only puzzle, given how incredibly wealthy we are by the standards of our ancestors, is why more people don't opt for the extra time instead of the extra money.
以前辈的标准衡量，我们现在极为富有。有鉴于此，唯一令人困惑的问题是，为何更多人不会选择更多休闲，而是选择去赚更多的钱。
When our ancestors painted beautiful works of art, were they intending them to be viewed by others, or did they just paint for their own pleasure?
我们的先人是什么时侯开始画上那些美丽的艺术作品，他们是否想让其他人看到这些画面，或者他们只是出于自己的快乐而绘画？
For ever since our ancestors died all things continue as they were from the beginning of creation.
因为从列祖睡了以来，万物与起初创造的时候仍是一样。
I stand here today humbled by the task before us, grateful for the trust you've bestowed, mindful of the sacrifices borne by our ancestors.
我今天站在这里，深感面前使命的重大，深谢你们赋予的信任，并铭记我们前辈所付的代价。
I stand here today humbled by the task before us, grateful for the trust you've bestowed, mindful of the sacrifices borne by our ancestors.
我今天站在这里，深感面前使命的重大，深谢你们赋予的信任，并铭记我们前辈所付的代价。
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