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.
水覆盖了地球表面的大部分。
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。
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.
有趣的是，至少在地球上它需要强酸性的水来形成。
The interesting thing is that on Earth at least it needs highly acidic water to form.
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。
Early life-forms on Earth were confined to the oceans because water was the only available protection they had against ultraviolet radiation.
我们地球表面的70%是水。
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。
We were discussing the geological evidence of liquid water on Earth and Mars three to four billion years ago.
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。
Earth is a rocky planet where there is liquid water, which is necessary for life to exist.
为了能够维持生命，这个新的星球不仅要有液态水，而且它的土表还必须是固态的，就像地球这样。
To be able to support life, the new planet would need not only to have water, but it would also need to be solid.
这表明，地球上的水可能来自内部，由于地质活动，被带到表面形成海洋。
This suggests that Earth's water may have come from inside, driven to the surface to form the oceans, by geological activity.
目前地球上大约2%的水以冰的形式冻结。
About 2 percent of Earth's water is currently frozen as ice.
邦德推测，这种交替循环可能是海-水间循环变化的证据，因此也会影响地球的气候。
Bond hypothesized that the alternating cycles might be evidence of changes in ocean-water circulation and therefore in Earth's climate.
为了地球的未来，节约每一滴水。
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。
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.
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。
We all know that though 75% of the earth is covered with water, only 3% of it is fresh water.
虽然地球的75%被水覆盖，但只有大约2%是来自河流、湖泊、冰雪的淡水。
While 75% of our planet is covered with water, only about 2% is fresh water that comes from rivers, lakes, ice and snow.
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。
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.
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。
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.
水不仅仅是地球的重要组成部分。
它是蓝色的，因为水几乎覆盖了地球表面的四分之三。
It's blue because water covers almost three quarters of the Earth's surface.
地球表面近四分之三被水覆盖。
Nearly three quarters of the earth's surface is covered by water.
你知道地球四分之三是被水覆盖的吗？
Do you know three quarters of the earth is covered with 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。
While nearly 3/4 of the earth is covered with water, we are short of drinking water.
所以我们要好好利用地球上的水。
在地球之外的地方发现水总能引起一阵激动。
There is always excitement when water is discovered anywhere but Earth.
地球内部的水呢？
地球上的雾，是由水升腾而来的。
地球上的水并不是很多。
地球上的水并不是很多。
应用推荐