They found deuterium at higher levels than it's found in Earth water-but at levels similar to the comets Hale-Bopp, Hyakutake and Halley.
数据显示月球水比地球水包含更多的重氢元素，并与海尔·波普彗星、百武彗星及哈雷彗星更为接近。
They found deuterium at higher levels than it's found in Earth water —but at levels similar to the comets Hale-Bopp, Hyakutake and Halley.
他们发现，同地球上的水相比，氘的含量更高——但同海尔·波普彗星、哈库塔克彗星和哈雷上的水有着相似的平。
They found deuterium at higher levels than it's found in Earth water - but at levels similar to the comets Hale-Bopp, Hyakutake and Halley.
他们发现，同地球上的水相比，氘的含量更高——但同海尔·波普彗星、哈库塔克彗星和哈雷上的水有着相似的平。
Researchers studying rocks brought back by astronauts have found that the moon's scarce water has a different chemical signature than Earth water.
研究人员通过研究宇航员从月球上带回的岩石发现月球上那少得可怜的水其化学成分跟地球上的水不同的。
Researchers studying rocks brought back by astronauts have found that the moon's scarce water has a different chemical signature than Earth water.
通过研究宇航员从月球上带回来的岩石标本，科学家们发现月球上稀少的水资源与地球水资源的化学成分并不相符。
What if there was no water on Earth?
如果地球上没有水怎么办？
It is called the bright-young-Sun solution, according to which the Sun would have provided enough heat for the water on Earth and Mars to be liquid.
它被称为“明亮的早期的太阳解决方案”，根据该方案，太阳将提供足够的热量，使地球和火星上的水变成液体。
The interesting thing is that on Earth at least it needs highly acidic water to form.
有趣的是，至少在地球上它需要强酸性的水来形成。
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。
First, a climate conducive to life on Earth depends upon the extraordinarily narrow orbital parameters that define a continuously habitable zone where water can exist in a liquid state.
首先，地球上适宜生命存在的气候取决于极其狭窄的轨道参数，这些参数定义了一个持续可居住的地带，在那里水可以以液态存在。
You know, I am still not too clear about the hydrologic cycle, the transfer of water back and forth between the earth and the atmosphere.
你知道，我仍然不是很清楚水文循环，也就是水在地球和大气之间的来回转移。
Think of wetlands as a giant sponge: the earth soaks up a lot of this water that's continually flooding the surface, which increases the amount of water below.
把湿地想象成一块巨大的海绵：地球吸收大量的不断涌向地表的，增加了地表以下水量的这些水。
As the water is pumped out, the vacant space left is compacted by the weight of the earth above.
当水被抽出来时，剩余的空间被上层的泥土填满压实。
We were discussing the geological evidence of liquid water on Earth and Mars three to four billion years ago.
我们讨论了30到40亿年前地球和火星上液态水存在的地质证据。
At first, the gugin had only five strings, representing the five elements of metal, wood, water, fire and earth.
起初，古琴只有五根弦，代表金、木、水、火、土五种元素。
Earth is a rocky planet where there is liquid water, which is necessary for life to exist.
地球是一个岩石行星，这里有液态水，这是生命存在的必要条件。
So, what evidence of a liquid water environment did we find in rock samples taking from the oldest rocks on Earth?
那么，在从地球上最古老的岩石中提取的岩石样本中，我们发现了什么液态水环境的证据呢？
The ancients conceived the earth as afloat in water.
古人认为地球漂浮在水里。
Even though our earth is rich in water resource, there is still a shortage of water in many places because ocean water can't be used directly.
尽管地球的水资源丰富，但由于海水不能直接被利用，所以仍有许多地方缺水。
We all know that though 75% of the earth is covered with water, only 3% of it is fresh water.
我们都知道虽然地球75%都被水覆盖，但是其中只有3%是淡水。
Save water for the future of our earth.
为了地球的未来，节约每一滴水。
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。
Plastic is burned outdoors and chemical water is poured into rivers, Greenpeace, an environmental group, has found the air, the earth and the rivers in Guiyu badly polluted.
塑料在户外被焚烧，化学药剂被排入河流，环保组织 Greenpeace发现贵屿的空气、土地和河流被严重污染。
Do you know three quarters of the earth is covered with water?
你知道地球四分之三是被水覆盖的吗？
While nearly 3/4 of the earth is covered with water, we are short of drinking water.
虽然地球近四分之三都被水覆盖，但我们依然缺乏饮用水。
One-ninth of all water on Earth is hydrogen.
地球上所有水的九分之一是氢。
So we should make good use of water on earth.
所以我们要好好利用地球上的水。
Yet our water is all the water Earth has ever had.
但我们现在还不知道地球上到底有多少水。
All life on Earth needs water, carbon-based organic molecules, and an energy source, either solar or chemical.
地球上所有的生命都需要水、碳基有机分子和某种能量来源——不是太阳能就是化学能。
His whole bearing had the appearance of an effort to keep clear of the imperfections which, through unguarded avenues, find entrance into earth, water and air, and into the ways of men.
他的整个行为举止都显示出这样的一种努力：清除一切因通过没有设防的道路而到达大地、水、空气和人身上的瑕疵。
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