地球上的水资源并不是很丰富。
据认为，地球上的水资源是有限的。
It is believed that the water resources on the earth are limited.
地球上的水资源虽然丰富，但可利用的淡水却很少。
Though the water resources are rich on the earth, the fresh water available is little.
地球上的水资源是有限的，是不可替代的人类生存的基础资源。
The water resource has a finite and cannot be substituted for human living.
如果我们不能正确使用地球上的水资源最后一滴水将是我们的泪珠。
If we could not make proper use of water resources on earth the last drop of water would be our tear drop.
由于人们没有意识到地球上的水资源是有限的，因此人们每天浪费了大量的水。
People, not realizing that water resources on the earth are limited, waste a great amount of water every day.
地球上的水资源总量是无法改变的，那么，我们能做的就只有改变自身的用水方式。
We can not change the total number of water in the world, however, all we can do is changing our way of using water.
我们在海里过度捕捞、深水钻井污染水资源、转向地球上最脏的能源形式比如说：尼古丁沙子。
We are overfishing our oceans, polluting our water with fracking and deepwater drilling, turning to the dirtiest forms of energy on the planet, like the Alberta tar sands.
在地球上可获得的所有水资源中，约有2.5%的水为淡水，有相当部分的淡水尚无法获取。
Of all the water available on Earth, about 2.5% is fresh, and a good part is inaccessible to us.
发现潜在的水资源显然对这个计划大有助益，特别是有可能为宇航员提供水库以资使用，而无需依靠从地球上运水。
Discovering a potential water supply has obvious benefits for that scheme, not least providing astronauts with a potential reservoir that they can tap into rather than rely on shipments from Earth.
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。
Researchers studying rocks brought back by astronauts have found that the moon's scarce water has a different chemical signature than Earth water.
众所周知，谁是生命之源。而且地球上可利用的水资源是有限的。
It is known to us all that water is the source of life. And the available water resources on the earth are quite limited.
大气层把地球上的热量和水资源从一个地方移动到另一个地方。
The atmosphere moves heat and water from place to place on Earth.
地球上可供开采的天然水资源是十分有限的。
Natural water resources that can be exploited in the earth are extremely limited.
水是滋养地球上所有生命最重要的元素，可是水资源却受到污染、过度捕捞、和浪费的严重威胁。
Water is the most important element in the world for the nourishment and life of all living things, yet in reality, it is threatened by the effects of pollution, overfishing and waste.
水是滋养地球上所有生命最重要的元素，可是水资源却受到污染、过度捕捞、和浪费的严重威胁。
Water is the most important element in the world for the nourishment and life of all living things, yet in reality, it is threatened by the effects of pollution, overfishing and waste.
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