The agricultural land is hilly and the irrigation poor.
这片农田多丘陵，而且灌溉条件很差。
The rivers merge just north of a vital irrigation system.
这些河流在一个重要的灌溉系统的北部汇合了。
If the irrigation plan goes ahead, it could spell disaster for the birds.
如果该灌溉计划继续的话，这对鸟类可能预示着灾难。
It was a three-year water irrigation project.
这是一项为期三年的灌溉工程。
Irrigation is needed to make crops grow in dry regions.
干旱地区需要灌溉才能使作物生长。
Excess water from irrigation sinks down into the water table.
灌溉产生的多余水分渗入地下水。
Rivers and lakes provide us with water transport and irrigation.
江河湖泽给我们以舟楫和灌溉之利。
However, water used in irrigation is often sourced unsustainably.
然而，灌溉用水的来源往往不是可持续的。
Irrigation is easy in the South because of the abundance of water.
南方多水，利于灌溉。
Most of these operations draw irrigation water from local rivers or lakes.
这些运行大多要从当地河湖里抽取灌溉水。
They increased the need for extensive irrigation in the Teotihuacán Valley.
他们在特奥蒂瓦坎山谷广泛灌溉的需要增加了。
Only by using modern irrigation methods can we reduce water shortage in agriculture.
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。
Certain irrigation practices degrade soil quality and reduce agricultural productivity.
某些灌溉措施会降低土壤质量，降低农业生产力。
Small blockages or collapses of the canal would choke the intricate irrigation networks.
运河的小堵塞或崩塌会阻塞错综复杂的灌溉网络。
The biggest challenge here is irrigation, which consumes 70% of the world's fresh water.
这里最大的难题就是灌溉，因为这消耗了世界上70%的淡水。
Hydroelectric power and flood control and irrigation are possible without building monster dams.
水力发电、防洪和灌溉都不需要建造大型水坝。
In the United States, by contrast, 41% water goes for agriculture, almost all of it for irrigation.
相反，美国41%的水投向了农业，并几乎全都用在了灌溉上。
Irrigation with saltish and fresh alternatively can decrease soil salt content and increase cotton yield.
采用咸淡水交替灌溉可以降低土壤含盐量，增加棉花产量。
In poor, dry regions, untreated wastewater is the only viable irrigation source to keep farmers in business.
在贫穷、干旱的地区，未经处理的废水是让农民维持生计的唯一可用灌溉资源。
The low utilization efficiency has resulted from the adoption of some traditional Chinese irrigation methods.
利用效率低的原因是采用了中国一些传统的灌溉方式。
The project finances small scale irrigation systems, feeder roads and other types of community infrastructure.
该项目资助小型灌溉系统、支路和其他类型的社区基础设施。
Donna helped the people of the village to organize an irrigation project, and she also advised them on planting crops.
唐娜帮助村民们规划了一个灌溉工程，还建议他们种庄稼。
The ensuing rapid expansion of irrigation agriculture, especially from the 1950s onward, transformed the economy of the region.
随之而来的灌溉农业的迅速发展，特别是从20世纪50年代以来，改变了该区域的经济。
Drip, or "micro" irrigation, as the name suggests, is stingier with the water, delivering it to the roots of plants drop by drop.
滴灌，或者“微”灌溉，顾名思义，是更吝啬于水，把水一滴一滴地滴到植物的根部。
Millions of irrigation wells in many countries are now pumping water out of underground sources faster than rainfall can refill them.
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。
More irrigation works would have to be built to feed the growing population, and this resulted in more power and wealth for the elite.
国家必须修建更多的灌溉工程来养活不断增长的人口，这为精英阶层带来了更多的权力和财富。
It was this that made the organization of irrigation, particularly the building of canals to channel and preserve the water, essential.
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。
Better irrigation can dramatically improve crop yield and about 40% of the world's food supply is currently derived from irrigated land.
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.
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。
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