Early life-forms on Earth were confined to the oceans because water was the only available protection they had against ultraviolet radiation.
地球上早期的生命形式被限制在海洋里，因为水是帮助它们抵御紫外线辐射的唯一有效保护。
Understanding this cycle is important, not only because it sustains life on Earth, but also because it is bound up with the rate of global warming.
理解这种循环很重要，不仅因为碳循环维持地球上的生命，而且因为它对于全球变暖的速度有密切关系。
These vents on the ocean floor, they release this incredibly hot water, 3 to 4 times the temperature that you boil water at, because this water has been heated deep within the Earth.
海底的这些喷口会释放出温度高得难以置信的热水，温度比开水还要高3到4倍，因为这些水是在地球深处加热的。
In Germany, being on time is risky enough because your hosts will probably already be there waiting, wondering how on earth you could be so stupid.
在德国，准时赴约已经够危险的了，因为你的东道主可能已经在那里等了，好奇你怎么会这么笨。
Many people look up to Yuan Longping because he spent all his life working for people on the earth.
许多人敬仰袁隆平，因为他一生都在为地球上的人们而工作。
But if someone said, you can see the craters on the moon from earth, would you disagree, because it is not clearly visible as such?
但如果有人说他可以在地球上看到月球上的陨石坑，你肯定不同意，因为还没那么清楚到足以看的出来是陨石坑。
That's fortunate for all life on Earth — because that's what allows stars to shine for billions of years — but it does make it a very difficult fusion fuel to utilize.
这是幸运的对于地球上的所有生命——因为正是因此才让星星们闪耀了数十亿年——但它造成了一个聚变燃料很难加以利用。
Sharing your testimony is an essential part of your mission on earth because it is unique. There is no other story just like yours, so only you can share it.
分享你的见证是你在世上使命的重要部分之一，因为你的见证是独特的，你若不与人分享，这见证便永远丧失了。
Understanding this cycle is important, both because it sustains life on Earth and because it is bound up with the rate of global warming.
理解这种循环很重要，不仅因为碳循环维持地球上的生命，而且因为它对于全球变暖的速度有密切关系。
And because they had the courage to answer them, we’ve had the good fortune to grow up in the greatest nation on Earth.
因为他们有勇气去回答，我们手握着一个让这个全世界最伟大的国家变得更美好的机遇。
This is the first time the technique has been used to date terrestrial rocks, because nothing else this old has ever been discovered on Earth.
这一方法首次被用于测定陆地岩石的年代，因为之前在地球上还没有发现过这么古老的东西。
The achievements of the past were possible because ordinary Americans demanded them, and meeting today’s environmental challenges will require a new generation to carry on Earth Day’s cause.
过去的成就之所以成为可能，是因为符合美国普通百姓的要求。 应对今天的环境挑战将要求新的一代继承地球日的事业。
Yes, this is bribery, and every parent and teacher on this earth has resorted to it many times, because used well, it works!
没错，这是在进行贿赂，世上的每个家长和老师无数次的采用这一方法。原因是这样做很有效。
NOBODY knows how many species exist on Earth, because no-one has yet counted them all.
没人知道地球上有多少物种，因为没人曾一一清点过。
You will never feel completely satisfied on earth, because you were made for more.
你在世上永远不会完全满足，因为你是为更大的目的而被造的。
A lunar-based radio telescope would be able to detect long wavelengths that cannot be sensed on Earth because they are absorbed by the outermost layers of the planet's atmosphere.
射电望远镜安装在月球背面就可以探测到那些无法在地球表面被检测到的长波，因为它们都被地球大气层的最外层吸收了。
That could affect weather on Earth because low solar activity has been linked to low global temperatures in the past.
这将很大程度上影响地球气候，因为从以往看，低迷的太阳活动往往跟全球低温密切相关。
But most people have never heard of space weather, which is a problem, because both high and low solar activity have serious effects on life on Earth.
然而，绝大多数人还从来没有听说过太空天气的事情。这是一个问题，因为太阳活动过于频繁与不足都会对地球上的生命造成严重影响。
That's because few people can even seem to agree on what cloud computing is, never mind how on earth it should work.
因为很少人真正理解什么是云计算，从来就不关心它怎么在地球上运作的。
That's because few people can even seem to agree on what cloud computing is never mind how on earth it should work.
因为很少人真正理解什么是云计算，从来就不关心它怎么在地球上运作的。
That's because extreme conditions on Earth may be somewhat similar to environments on other planets.
因为地球上的这种极端环境可能与其它星球上的环境相似。
The book was a big hit because the first third of it compared how the kingdom of God was reflected on earth in the Kings who ruled there.
这本书十分畅销，因为前三分之一的篇幅都在比较天国是如何反映在人间国王统治的土地之上。
Your academics look for life on other planets within your solar system, and because they are different from your Earth, assume that no life exists upon them.
你们的专家在你们太阳系内其他的行星上寻找生命，正因为那些生命形式不同于你们地球上的，才会得出一个“假设”结论——那些行星上面没有生命存在。
Because simpler membranes are more likely to have formed from the natural organic chemistry factory on prelife Earth, the protocell project is working on plainer lipids - chiefly ordinary fatty acids.
由于在无生命的地球上，天然有机化学系统很可能形成较简单的膜，所以本次古生物工程也采用较简单的脂质——主要是普通脂肪酸。
Because it reaches every child in one of the most populous, fastest-growing countries on earth.
因为这一规划影响到了地球上其中一个人口最多、增长速度最快国家中的每一位儿童。
"It's what we fought the war for," Bean chimed in. "the Formics wanted Earth because it was just like the worlds they already lived on."
“那就是我们打仗的目标嘛，”比恩插嘴道，“虫族想要地球，就是因为地球跟它们生活的世界很像，现在它们走了，我们得到他们的世界，也是很适合我们的。”
Some excited people have likened this technological upheaval to the Cambrian explosion 500m years ago, when evolution on Earth speeded up in part because the cell had been perfected and standardised.
一些乐观的人士将这种技术的繁荣比作是5亿年前寒武纪的大爆炸，当时地球上的进化在某种程度上呈爆发态势，因为细胞已经开始完善和正常化。
The similarities between the two sets of rocks in terms of carbonates is important because Pilbara is used to study the early stages of life on Earth 3.5 billion years ago.
两组岩石群所含有的碳酸盐十分相近，而这一点对于研究来说十分关键，因为皮尔巴拉地区的岩石被用于研究35亿年前地球早期阶段的生命。
Research on cold-loving Earth organisms is especially valuable, McKay says, because "all the places in the solar system that may harbour life" - like Mars and Europa - "are cold and icy".
对喜欢寒冷的地球有机体的研究格外有价值，McKay称，因为“太阳系中可能支持生命的所有地方”——比如火星和欧罗巴——“都是寒冷冰封的。”
Research on cold-loving Earth organisms is especially valuable, McKay says, because "all the places in the solar system that may harbour life" - like Mars and Europa - "are cold and icy".
对喜欢寒冷的地球有机体的研究格外有价值，McKay称，因为“太阳系中可能支持生命的所有地方”——比如火星和欧罗巴——“都是寒冷冰封的。”
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