Scientists think there was probably water on the planet long ago.
科学家们认为很久以前在那个行星上可能有水存在。
To be able to support life, the new planet would need not only to have water, but it would also need to be solid.
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。
Indeed we share the same planet, breath the same air and drink the same water.
事实上我们共同拥有一个星球，呼吸一样的空气，饮用一样的水。
Viewed from space, the most striking feature of our planet is the water.
从太空看地球，我们星球最引人注目的特点就是水。
Scientists already suspect the red planet has water.
科学家已经猜测这颗红色的行星上有水。
It is the second densest planet in Solar System; 5.3 times that of water.
水星在太阳系中是密度第二大的行星，是水的密度的5.3倍。
A new theory suggests that water was already present at the birth of our planet.
不过一些新研究表明，水可能在地球诞生之初就已经存在。
Their shade cools the planet and their water vapor traps heat from the sun.
云彩的阴影使地球变得凉爽，云彩中的水蒸气则留住了来自太阳的热量。
What can we do to protect the water on our planet?
我们能做些什么来保护我们这个星球上的水呢？
Water gives life to our planet.
水给我们的星球带来了生命。
It can also help them decide whether the planet had liquid water.
而且，这可以帮助他们研究火星上到底有没有液态的水。
Water is an unique resource which always sustains life of all kind on our planet.
水是在这个地球上维持各种生命的一种独有的资源。
For our human beings and our planet we must protect water.
为了我们和我们的星球，我们一定要保护水资源。
For our human beings and our planet, we must protect water.
为了我们和我们的星球，我们一定要保护水资源。
Will the oceans rise dramatically and our planet become a water world?
海洋面会急剧上涨吗？我们的星球会变成一个水中天下吗？
And maybe that companation produced the water on the surface of the planet.
并且那个完成可能保证了水在那个行星表面。
For our human beings and our planet we must protect water.
为了我们和我们的星球，我们必须要保护水资源。
Mars is also a planet that has water on its surface besides the earth.
除地球以外，火星也是一个存在表层水的行星。
Overall, More than 70 percent of the surface of our planet is covered by water.
我们这个行星总共有百分之七十多的表面覆盖着水。
Altogether more than 70 percent of the surface of our planet is covered by water.
整个说来，我们这个星球的表面有百分之七十以上为水所覆盖。
Overall, more than 70 percent of the surface of our planet is covered by water.
总之，我们这个星球表面百分之七十以上被水覆盖。
The temperature must be right for water on the planet to remain in liquid form.
而要令水保持液 体状态，就须有合适的气温。
Altogether more than 70 percent of the surface of our planet is covered by water.
总的来说，总的来说，我们这个行星的表面有百分之七十是为水覆盖的。七十是为水覆盖的。
More than 70 percent of the surface of ouor planet is covered by water.
我们星球的表面百分之七十多都被水覆盖着。
More than 70 percent of the surface of ouor planet is covered by water.
我们星球的表面百分之七十多都被水覆盖着。
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