groundwater

1. A groundwater reservoir from which water can be extracted is called an aquifer.: 可以从中抽取水的地下蓄水层被称为含水层。

2. Wetlands have a big effect on groundwater, the amount of water below the surface of the land.: 湿地对地下水，即地表以下的水量影响很大。

3. It is known that the distribution of groundwater is uneven, and that much of it lies at great depths.: 大家知道，地下水的分布是不均匀的，而且它们大部分都埋在很深的地方。

4. Research from the exhaustive study of groundwater from over 950 drilling logs has just been published.: 从950多篇钻井日志中产出的对地下水问题的详尽研究刚刚发表。

5. Groundwater is the word used to describe water that saturates the ground, filling all the available spaces.: 地下水这个词描述的是水浸透土地，并填充所有可利用的空间。

6. Over millions of years, groundwater left deposits of a mineral called calcite, on the rock within Devil's Hole.: 在数百万年的时间里，地下水在魔鬼洞内的岩石上留下了一种叫做方解石的矿物质沉积物。

7. In addition, new coffee-growing techniques are poisoning the water locally, and eventually the world's groundwater.: 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。

8. Unlike meat from those filthy places, it will not pollute rivers and streams, deplete groundwater or cause deforestation.: 不像来自那些污秽场所的肉，它不会污染河流和小溪，不会大量消耗地下水，也不会引起滥伐森林。

9. The impact of rainfall upon the surface water and groundwater resources of the desert is greatly influenced by landforms.: 降雨对于沙漠地表水和地下水资源的影响很大程度上取决于地形。

10. Such programs are much needed because in many arid lands there is only a vague idea of the extent of groundwater resources.: 这样的计划是非常必要的，因为在许多干旱地区，我们并不清楚其地下水资源的范围。

11. The mineral content of groundwater normally increases with the depth, but even quite shallow aquifers can be highly saline.: 地下水的矿物含量通常随深度的增加而增加，但即使很浅的蓄水层中可能含盐量也很高。

12. These are generally fed by groundwater springs, and many issued from limestone massifs, such as the Atlas Mountains in Morocco.: 它们通常由地下泉水供养，其中许多流自石灰岩山丘，如摩洛哥的阿特拉斯山脉。

13. Deserts contain large amounts of groundwater when compared to the amounts they hold in surface stores such as lakes and rivers.: 与湖泊、河流等地表储存的地下水相比，沙漠中含有大量的地下水。

14. Because they are porous, sedimentary rocks, such as sandstones and conglomerates, are important potential sources of groundwater.: 由于像如砂岩和砾岩这样的沉积岩是多孔的，它们是地下水的重要潜在来源。

15. Groundwater commonly collects in stream drainages but may remain entirely beneath the surface of dry stream-beds in arid regions.: 地下水通常聚集在河流流域，但在干旱地区，地下水也可能完全保留在干涸河床的表面之下。

16. By far the most abundant type of groundwater is meteoric water; this is the groundwater that circulates as part of the water cycle.: 到目前为止，最丰富的地下水资源是雨水；这是地下水在水循环中的一个环节。

17. Groundwater aquifers are being pumped down faster than they are naturally replenished in parts of India, China, the USA and elsewhere.: 在印度、中国、美国等地，地下含水层被抽离的速度比自然补给还要快。

18. The engine helped solve the problem of draining coal mines of groundwater and increased the production of coal needed to power steam engines elsewhere.: 这台发动机帮助解决了煤矿地下水的排放问题，并增加了其他地方蒸汽机所需的煤炭产量。

19. Most of the world's potable water—freshwater suitable for drinking—is accounted for by groundwater, which is stored in the pores and fractures in rocks.: 世界上大部分的饮用水——适合饮用的淡水——是由地下水提供的，它储存在岩石的孔隙和裂缝中。

20. 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.: 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。

21. However, even igneous and metamorphic rocks may act as groundwater reservoirs if extensive fracturing occurs in such rocks and if the fracture system is interconnected.: 然而，如果火成岩和变质岩中发生大规模的断裂，并且断裂系统相互连通，那么它们也可以作为地下水储集层。

22. Because the surface of the water table is not flat but instead rises and falls with topography, groundwater is affected by gravity in the same fashion as surface water.: 由于地下水位不是平面的，而是随着地形起伏的，所以地下水和地表水一样受到重力的影响。

23. Some areas, because of their soil texture, topographical position, or distance from rivers or groundwater, have virtually no water available to plants, whereas others do.: 有些地区由于土质、地形位置或与河流或地下水的距离，几乎没有水分能提供给植物，而另一些地区则有。

24. They lack water-storing structures, and their existence on rock faces prevents them from tapping groundwater, so they have instead developed the ability to change their metabolism.: 它们缺乏储水结构，而且它们长在岩石表面，这阻止了它们利用地下水，所以它们反而形成了改变新陈代谢的能力。

25. Note the word "net": measuring the actual amounts of groundwater seepage into the lake and out of the lake is a much more complicated matter than merely inferring their difference.: 注意“净”这个词：测量渗入湖泊和流出湖泊的地下水的实际数量是一个比仅仅推断它们之间的差异要复杂得多的问题。

26. The United Nations Environment Programme and the World Bank have funded attempts to survey the groundwater resources of arid lands and to develop appropriate extraction techniques.: 美国国家环境总署和世界银行开始拨款并着手调查干旱地区的地下水资源，以开发合适的开采技术。

27. If the water table intersect the land surface, groundwater will flow out onto the surface at springs, whether to be collected there or to subsequently flow farther along a drainage.: 如果地下水位与地表相交，地下水将在泉水处流出地表，聚集于此或是随后沿着排水系统进一步流动。

28. The water is usually naturally occurring groundwater that seeps down along fractures in the rock; less typically, the water is artificially introduced by being pumped down from the surface.: 水通常是自然形成的地下水，沿着岩石的裂缝渗出；不那么典型的是，水是通过从地表抽水而人工引入的。

29. Some rubbish will pollute the groundwater.: 一些垃圾会污染地下水。

30. Banyan trees, unlike rubber trees, can keep groundwater.: 与橡胶树不同，榕树可以保存地下水。

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