他们在特奥蒂瓦坎山谷广泛灌溉的需要增加了。
They increased the need for extensive irrigation in the Teotihuacán Valley.
正是这点使得灌溉的统筹，特别是建造运河以疏导和保护水，变得至关重要。
It was this that made the organization of irrigation, particularly the building of canals to channel and preserve the water, essential.
世界粮食一半以上来自依靠雨水而非依靠灌溉的农田。
Over half of world's food comes from rain-fed farms, as opposed to irrigated ones.
对于那些还立着的庄稼，寻找灌溉的水是优先考虑的事。
For those crops that are still standing, finding water for irrigation is a top priority.
还有一个小组在加纳开发了一种移动脚踏泵，农民可以此获得用于灌溉的水。
Another team developed a mobile bicycle pump in Ghana to help farmers get water for irrigation.
许多国家还通过水务决策的分散化甚至灌溉的私有化(摩洛哥)来提高效率。
Many countries are also managing water resources more efficiently by decentralizing water decision-making, and even privatizing irrigation (Morocco).
这证明了水管理系统曾经可以通过灌溉的方式，为很多人提供额外的食物。
This proved that the water management system was capable of providing additional food by way of irrigation to a substantial number of people.
我们粮农组织认为，农业部门必须带头，通过确定雨育田保墒和农田灌溉的更有效办法来应对水短缺问题。
We at FAO recognize that the agriculture sector must take the lead in coping with water scarcity by finding more effective ways to conserve rain-fed moisture and irrigate farmlands.
农业在经过灌溉的20%耕地上提供了全球40%的粮食生产，使用了整个淡水取用量的大约70%。
Agriculture yields 40% of the global food production under irrigation on 20% of the cultivated land, using about 70% of all freshwater withdrawals.
没有灌溉的保证，没有任何农作物能够在这个墨累河与马兰比季河的交汇处南威尔士，这片西南部的干旱平原生长。
Without irrigation, no crops would grow in the dry plains of south-western New south Wales, where the Murrumbidgee meets the Murray.
例如，东部非洲和南部非洲，估计有五亿九千六百七十公顷适合灌溉的土地，但只有其中百分之二有灌溉系统。
For instance, in eastern and southern Africa, an estimated 596.7m hectares are suitable for irrigation, yet only 2% of this land has any irrigation system in place.
水之所以这么重要的原因是，灌溉的田地产量高。 虽然只占世界总耕地的五分之一，但是生产了世界粮食的五分之四。
The reason water matters so much is that irrigated farming is so productive.
在世界的许多地区，灌溉的不适当管理与疟疾、血吸虫病(裂体血吸虫)以及其它媒体传播疾病的增加风险有关。
In many parts of the world, inadequate management of irrigation is linked to increased risks of malaria, schistosomiasis (bilharzia) and other vector-borne diseases.
将要求会议考虑许多地区，尤其是边缘地区面对的“冲突/交换”复杂问题，其中包括增加灌溉的前景非常有限的干旱地区。
The meeting will be invited to consider the complex “conflicts/trade offs” that face many areas, especially marginal ones, including drylands when prospects for increased irrigation are limited.
从20世纪70年代到80年代，在此繁荣景象出现之前持续了十年干旱，干旱扩大了灌溉的需要，导致墨累河成了涓涓细流。
But the ten years of drought before this efflorescence followed a huge expansion of irrigation in the 1970s and 1980s that reduced the flow of the Murray to a trickle.
超过三分之二的城市，其中一半以上的农田是使用废水来灌溉的，这些数字累加起来达到40万公顷(98.8万英亩)。
In more than two-thirds of the cities, over half the agricultural land is irrigated with wastewater-400, 000 hectares (988, 000 acres), all told.
像这样的高层农场还没有真正建成，但在英格兰德文郡的佩恩顿动物园（Paignton Zoo）里，一个液体耕种、精细灌溉的菜园已经运营数月了。
Such a high-rise farm has not yet been built. But in Devon, England, the Paignton Zoo has maintained a hydroponic, controlled-irrigation garden for several months.
一百年前的1911年3月，《美国经济评论》(American EconomicReview)登出了第一篇文章，内容是关于美国西部被太阳晒到起泡的沙漠的灌溉的。
ONE hundred years ago, in March 1911, the American Economic Review (AER) published its first article-on irrigation in the "sun-blistered" deserts of the western United States.
灌溉产生的多余水分渗入地下水。
Excess water from irrigation sinks down into the water table.
更好的灌溉可以显著提高作物产量；目前，全球约40%的粮食供应都来自于灌溉地。
Better irrigation can dramatically improve crop yield and about 40% of the world's food supply is currently derived from irrigated land.
南非中部，一群玉米农挤成一团，围着一名农学家和他放在灌溉机旁的电脑。
A group of corn farmers stands huddled around an agronomist and his computer on the side of an irrigation machine in central South Africa.
然而，灌溉用水的来源往往不是可持续的。
However, water used in irrigation is often sourced unsustainably.
只有使用现代的灌溉方法，我们才能减少农业用水短缺的情况。
Only by using modern irrigation methods can we reduce water shortage in agriculture.
这种情形始于在目标地区（如废弃矿井或被污水污染的灌溉池）种植超积累物种。
This scenario begins with the planting of hyperaccumulating species in the target area, such as an abandoned mine or an irrigation pond contaminated by runoff.
利用效率低的原因是采用了中国一些传统的灌溉方式。
The low utilization efficiency has resulted from the adoption of some traditional Chinese irrigation methods.
这些管道被认为是为灌溉地表而修建的运河系统。
The lines were thought to have been a system of canals that had been built to irrigate the surface.
在那里，空气吸收了更多的水分，然后将水分凝结在由海水冷却的金属壁上，从而收集用于灌溉植物的蒸馏水。
There the air absorbs more moisture, which then condenses on a metal wall cooled by seawater, and thus distilled water for irrigating the plants collects.
现代灌溉方法的优点之一是，仅凭它们就可以节省目前灌溉用水浪费量的20%-30%。
One of the advantages of modern irrigation methods is that they alone can save 20-30 percent of the present volume of wasted irrigation water.
现代灌溉方法的优点之一是，仅凭它们就可以节省目前灌溉用水浪费量的20%-30%。
One of the advantages of modern irrigation methods is that they alone can save 20-30 percent of the present volume of wasted irrigation water.
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