水库正在干涸，农民开始离开田地去寻找水源。
Reservoirs are drying up and farmers have begun to leave their land in search of water.
泄漏的煤油已污染了水源。
长时间干旱，水源都枯竭了。
莫里斯湖每年从尼罗河的洪水中获取水源。
Lake Moeris received its water from the annual floods of the Nile.
以色列提开采了约旦河上游约65%的水源。
Israel has extracted about 65% of the water upstream of the Jordan River.
降雨量有限，每年融化的雪水洪流冲过平原，成为滋润此地的水源。
Rainfall was limited, and what water there was rushed across the plain in the annual flood of melted snow.
此外，新的咖啡种植技术会污染当地水源，最终会影响到全球的地下水。
In addition, new coffee-growing techniques are poisoning the water locally, and eventually the world's groundwater.
这些水源的一个问题是，深水区的含盐量也比浅水层的含盐量高。
One problem with these sources is that the deep water also has a higher level of salt than shallower aquifers.
他提起两个塑料水桶奔向村子的中心位置，消防车每天都会来这里一次，为居民们提供水源。
He picked up two plastic buckets and rushed to the center of the village, where a fire engine arrives once a day to provide water for residents.
在许多国家，数以百万计的灌溉井现在从地下水源抽水的速度，超过了降雨所能再次填满的速度。
Millions of irrigation wells in many countries are now pumping water out of underground sources faster than rainfall can refill them.
当美国国家宇航局去年为了寻找水源在月球上炸出一个洞的时候，科学家就认为会溅起水花。
When NASA blasted a hole in the moon last year in search of water, scientists figured there would be a splash.
比如，几个世纪以来，尼罗河、底格里斯河和幼发拉底河每年的洪水给下游山谷的居民带来了肥沃的淤泥和水源。
For centuries, the annual floods of the Nile, Tigris, and Euphrates, for example, have brought fertile silts and water to the inhabitants of their lower valleys.
要做到这一点，我们得把水从土地中排出来，把它移到别的地方，并引导其他水源转向，比如河流。
To do that, you have to drain the water from the land, move the water elsewhere, and divert the water sources such as rivers.
当美国国家宇航局去年为了寻找水源在月球上炸出一个洞的时候，科学家就认为会溅起水花。
When NASA blasted a hole in the moon last year in search of water, scientists figured there would be a splash.
人类和野生动物都在不停地迁徙，以寻找食物和可靠的水源。
Both humans and animals were constantly on the move, in search of food and reliable water supplies.
一国财富在很大程度上受其自然资源影响，比如：煤炭、黄金或其他矿物质、水源等等。
Wealth depends to a great extent upon a country's natural resources, such as coal, gold, and other minerals, water supply and so on.
有些植物储存水分来使它们度过干旱；另一些则把根深深地扎入地下水源。
Some plants store reserves of water to see them through a drought; others send roots deep down to subsurface water supplies.
这就是露水池的水源头，是下方大片的紫杉和无花果树所需潮湿空气的来源，也是土壤的来源。
That is what provides the water for Dew Pond, the moist air under the spreading yews and figs below it, and the soil.
然而，粮食短缺和干旱的出现导致了一些地区的饥荒和灾难，而且工业和农业副产品也污染了水源。
Yet occurrences of food shortages and droughts are causing famine and distress in some areas, and industrial and agricultural by-products are polluting water supplies.
粮食短缺和干旱的出现导致了一些地区的饥荒和灾难，而且工业和农业的副产品也污染了水源。
Occurrences of food shortages and droughts are causing famine and distress in some areas, and industrial and agricultural by-products are polluting water supplies.
同时，牲畜和人类的行动范围都受到了更大的限制，在很长一段时间内都要待在离永久水源更近的地方。
At the same time, both cattle and humans were more confined in their movements, staying much closer to permanent water supplies for long periods of time.
在这座山的北面，海拔900米以上的位置有一个非常重要的纯净水水源地。
More than 900 metres high, on the mountain's north face, lies an all-important source of pure water.
一些历史记录显示，当时水源性疾病的发病率发生了变化，尤其是痢疾。
Some digging around in historical records revealed that there was a change in the incidence of water-borne disease at that time, especially dysentery.
一旦这些植物耗尽它们储存的水或者用完地下水源，它们就会停止生长并开始死亡。
Once these plants use up their stored reserve or tap out the underground supply, they cease growing and start to die.
虽然我们现在的水供给很充裕，因为我们现在有四种途径来获得水源，我们想让人们明白它的来之不易。
While we have ample supplies of water because of the four different sources of water that we now have, we do want people to realize that this don't come easy.
其他的井设计更加精巧，长长的台阶延伸好几层然后到达水源处。
Others are more elaborate, with long stepped passages leading to the water via several storeys.
这类植物通过生长出长长的主根来适应环境，这些主根可以向下渗透，直达地下水提供的充足水源。
These have adapted to the environment by the development of long taproots that penetrate downward until they approach the assured water supply provided by groundwater.
植物能保持空气清新和水源清洁。
一天，一个农夫正在为他的农场寻找水源。
One day, a farmer was looking for a water source for his farm.
它还会导致更多的空气污染、疾病和缺乏清洁水源等。
It will also cause more air pollution, diseases and lack of clean water and so on.
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