除此之外，史前人类使用的技术看起来比较简陋。
Beside this, prehistoric man looks technologically primitive.
史前人类从未向雷克斯暴龙扔过长矛，但确实猎杀过猛犸象和乳齿象。
Prehistoric humans never threw spears at Tyrannosaurus rex but really did hunt mammoths and mastodons.
当史前人类来到一处新地方时，一些奇怪的事情发生在大型动物身上，那就是它们突然灭绝了。
When prehistoric man arrived in new parts of the world, something strange happened to the large animals: they suddenly became extinct.
科学家们表示，史前人类的饮食可能需要更多咀嚼齿。
Scientists say the diet of prehistoric humans probably required more chewing teeth.
这些发现还可能解答史前人类和原始人类吃些什么的问题。
The findings can also reveal which animals prehistoric humans and human ancestors ate.
他指出，外星人可能会利用目前人类力所不及的技术展现自己。
Aliens could reveal themselves with technologies that are currently far beyond the scope of humans, he pointed out.
目前人类所应用的所有纤维之中，有很大的百分比是人造的。
Of all the fibers now used by man, a very large percentage is man-made.
研究人员说，这是目前人类所发现的最小的有行星环绕的恒星。
The researchers said this is the smallest star around which planets have been discovered.
当地民间传说中称，史前人类把野牛从这些悬崖上驱赶下去。
Local folklore has it that prehistoric men drove cattle over these cliffs.
他认为，史前人类对食物的接触度不同，导致了今天性别化的饮食习惯。
Differing access to foods in prehistoric times, he says, led to gendered patterns of eating today.
以此类比，加倍增长的计算能力将足以拉近目前人类与机器智能之间宽阔的鸿沟。
By analogy, enough doublings in processing power will close today's vast gap between machine and human intelligence.
红色或黄色赭石——一种在陶土中的含铁矿石，在近东和非洲的史前人类遗址随处可见。
Red or yellow ochre, an iron-containing pigment found in some clays, is ubiquitous at early modern human sites in Africa and the Near East.
从前人类只会利用地球，如今人人必须保护地球，保护这个身处险境的星球。
Previously, mankind only used the Earth. Now everyone must protect planet Earth, a planet in danger.
科学家们在发现了400，000年前人类的残骸后，不得不重新书写现代人类的进化史。
Scientists could be forced to re-write the history of the evolution of modern man after the discovery of 400, 000-year-old human remains.
事实上，近年来，考古学家已经找到了早至7500年前人类沿着海湾沿岸定居的证据。
In fact, in recent years, archaeologists have turned up evidence of a wave of human settlements along the shores of the Gulf dating to about 7, 500 years ago.
事实上，近年来，考古学家已经找到了早至7500年前人类沿着海湾沿岸定居的证据。
In fact, in recent years, archaeologists have turned up evidence of a wave of human settlements along the shores of the Gulf dating to about 7,500 years ago.
通过测定当前人类种群间的亲缘关系，作者们弄清了地球上早期人类迁移的路线。
By measuring how closely current populations are related, the authors trace the routes by which early humans migrated around the earth.
他认为，在过去的600万年到700万年里，史前人类的进化中至少出现了20个物种。
Hominid evolution over the past 6 million to 7 million years includes at least two dozen species, in Tattersall's view.
有些研究来源于考古地点发现的史前人类骨骼遗骸，平均起来看，有15%死于他人的暴力行为。
Some studies are based on skeletons found at archaeological sites; averaging their results suggests that 15 percent of prehistoric humans met a violent death at the hands of another person.
而且目前人类活动产生的二氧化碳已经超出了自然所能将其处理的限度，这一点也已被广泛认同。
It is also well established that human activity is putting more of it into the atmosphere than natural processes can currently remove.
据一项新的理论说，史前人类也有类似系统，他们利用石圈和其它标记物为穿越英国的旅行者导航。
According to a new theory, prehistoric man navigated his way across England using a similar system based on stone circles and other markers.
目前人类动力学是一个新的研究领域，科学家还不确定能从中发现什么，以及如何利用这些成果。
He says this field is so new, scientists aren't exactly sure what they're going to find, or how to use it.
气候变化是当前人类面临的严重的全球性环境问题，温室气体排放是引起全球气候变化的一个重要原因。
Climate change is a serious global environmental problem facing man. Greenhouse gas emission is an important reason for global climate change.
自大约1.5万年前人类生起第一堆火起，光污染问题就一直伴随着人类，科学技术只是令这一问题更加严重而已。
Light pollution is a problem that has been accompanying man ever since he started his first fire some 15, 000 years ago, and technology has only made it worse.
自大约1.5万年前人类生起第一堆火起，光污染问题就一直伴随着人类，科学技术只是令这一问题更加严重而已。
Light pollution is a problem that has been accompanying man ever since he started his first fire some 15,000 years ago, and technology has only made it worse.
她叙述起百万年前人类的远古历史：狩猎采集者们会以小团体的形式游荡在无树草原上，然后每年在不同的水源聚集几次。
She conjures millions of years of human prehistory: small groups of hunter-gatherers wandering the savanna, and then congregating a few times a year at this or that watering hole.
它们是地外文明来访、时间旅行者或者遗失文明如阿特兰蒂斯的证据——又或许是某些比我们想象还要先进的史前人类展示给我们的东西。
They're evidence of extraterrestrial visitation, time travelers or lost civilizations like Atlantis - or perhaps they're here to show us that some ancient peoples were far more advanced than we think.
它们是地外文明来访、时间旅行者或者遗失文明如阿特兰蒂斯的证据——又或许是某些比我们想象还要先进的史前人类展示给我们的东西。
They're evidence of extraterrestrial visitation, time travelers or lost civilizations like Atlantis - or perhaps they're here to show us that some ancient peoples were far more advanced than we think.
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