A period in the history of the earth, usually shorter than an epoch.
期，纪：地球历史进程中的一个时期，通常比世短。
There are many gradations of evolutionary events in the history of the Earth.
在地球的历史上，存在着不同层次的生物进化事件。
Animal EXTINCTION Many animals have disappeared during the long history of the earth.
动物天地从地球有史以来的这段漫长时期，许多动物都消失了。
Looking ahead 2011 is to be most memorable and will eventually re-write the history of the Earth.
前瞻2011年，将是最值得健忘的，并且会最终改写地球的历史。
It has happened thousands of times in the history of the earth, he contends, in clock-like fashion.
已经发生数千次的历史中，地球，他争辩，时钟样的方式。
Geology is the study of the Earth's crust. We can understand the history of the Earth through this field.
地质学是对地球地壳的研究。我们可以通过此项领域来了解地球的历史。
And the tides created by the moon churned these into the most crucial cocktail in the history of the earth-the 14 Primordial Soup.
由月亮引起的潮汐把这些都调成了地球历史上起决定性作用的鸡尾酒——地球原生汤。
It's part of the Earth that has managed to stay at the surface for around 3.5 billion years - so about three quarters of the history of the Earth.
作为地球的一部分，它屹立在那里已经有约35亿年的时间了，相当于地球四分之三的历史。
Finally, the implications of tidal rhythmites for the Earth's rotation and the history of the Earth-Moon system in geological past are concluded.
最后，对潮汐韵律层在推测地史时期地-月系的演化历史中的意义作了评述。
They believe that beneath the Moon's dust-covered surface they will find the remains of meteorites that date back to the early history of the earth.
他们相信在布满尘土的月球表面之下，能找到年份可追溯至地球早期历史的陨石残馀物。
The scale of view ranges from global to atomic, and the broad scope of research includes physical, chemical, and biological processes, as well as the unique history of the Earth.
该方向的研究范围从整个地球到原子级别，相当宽泛，包括物理、化学、生物和地球的独特历史。
Geological heritage recorded the history of the earth evolution. It is precious natural heritage endowed by the nature. Protecting geological heritage is a responsibility of human nature.
地质遗迹记载着地球演化的历史，是大自然赋予人类的珍贵的自然遗产，保护地质遗迹是人类的责任。
This metallic core gives Earth its characteristic magnetic field, which has played an extremely important role in the history of our planet.
这种金属核赋予地球特有的磁场，在地球的历史上发挥了极其重要的作用。
There is growing evidence that the presence of humans has altered the Earth so much that a new Epoch of geologic history has begun—the Anthropocene Epoch, a new human-influenced Epoch.
有越来越多的证据表明，人类的存在使地球发生了巨大的变化，地质史上的一个新时代已经开始了——即人世时代，一个受人类影响的新时代。
For more than a century, Tyrannosaurus rex has been the King of Dinosaurs, the carnivorous symbol of an entire age in the history of life on Earth.
近一个多世纪以来，雷克斯暴龙不但成为了恐龙帝国的统治者，更是整个地球生命史的肉食象征。
The idea here is that - while Earth formed slowly from planetary embryos colliding - Mars is itself a solitary planetary embryo that formed very early in the history of our solar system.
这里想表达的观点是，当地球从行星胚胎间相互碰撞缓慢形成时，火星却是一个孤独的行星胚胎，在太阳系历史上形成得很早。
In the beginning, in a far distant past of Earth history, humans and animals used to cohabit very lovingly and peacefully.
开元时期，在地球历史上的遥远过去，人类和动物原本是同居一起，非常友好与和平。
In the future, if any alien civilization arrives to Earth, they would be able to instantly tell the history of Earth's geography and know where in time we lived.
包括加州漂移到太平洋”在遥远的未来，如果任何一个外星文明到达地球，他们就会被告知地球形成的历史并且知道我们生活在哪个时期。
This is a crucial but understudied compartment of the global Marine carbon cycle, which has been of key importance throughout Earth history and it is still at present.
这是全球海洋碳循环重要的替代部分，其重要性贯穿地球历史，而且依然存在。
If my discoveries can contribute a new piece of the puzzle to explain the history of life on Earth, that's really exciting.
如果我的发现能有助于解释地球生命的历史，那真是太激动人心了。
The Earth has witnessed several mass extinctions in its 4.5bn year history, but the event that struck at the end of the Permian was unequaled in scale.
地球在她45亿年的历史长河中，已经见证了几次大规模的灭绝，但是发生在二叠纪末的整个重大事件在规模上堪称史无前例。
Evolutionary time, in which 6,895 days represent a mere.000000005% of the 3.5 billion year history of life on Earth.
演变着的时间——6895天仅仅相当于地球35亿年历史的0.00000005%。
Athos is a relic of human history. It is the last male retreat on earth.
阿陀斯是人类历史的一个古迹，也是男子在地球上的最后一个隐居地。
Professor Massey, a cosmologist, explained that the moon was almost as old as the earth, and it would be a shame to lose such a marvelous piece of planetary history.
梅西教授，这位宇宙学家解释说，月亮几乎地球一样的古老，失去这样奇妙的行星将是历史的一个耻辱。
UFO sightings have been reported throughout recorded history and in various parts of the world, raising questions about life on other planets and whether extraterrestrials have visited Earth.
在全世界各地不同时期都有ufo目击的报告，引起人们关于外星生命以及地外生命是否访问过地球的争论。
The Colorado River flows through the Grand Canyon. The Canyon offers a lot of information about the physical history of Earth.
科罗拉多河流经大峡谷，大峡谷向我们提供了许多有关地球自然历史的信息。
At Epcot the main attraction (that big giant Epcot ball) houses Spaceship Earth; a ride that takes you back through the history of our little planet.
在未来世界，最主要的景观（巨大的爱波皮卡球）内有太空船地球；星球历史之旅。
Yet a rocky world named Kepler 10b is being described by astronomers as one of the greatest discoveries in history – a ‘missing link’ between Earth and the giant planets made of gas.
一个命名为开普勒10的岩石星球被天文学家描述为历史上最伟大的发现之一—地球与巨大星球关于气体缺失了链接。
Yet a rocky world named Kepler 10b is being described by astronomers as one of the greatest discoveries in history – a ‘missing link’ between Earth and the giant planets made of gas.
一个命名为开普勒10的岩石星球被天文学家描述为历史上最伟大的发现之一—地球与巨大星球关于气体缺失了链接。
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