One of the advantages of modern irrigation methods is that they alone can save 20-30 percent of the present volume of wasted irrigationwater.
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%。
2
Most of these operations draw irrigationwater from local rivers or lakes.
这些运行大多要从当地河湖里抽取灌溉水。
3
Often the cheapest way to provide irrigationwater in the dry tropics is through small-scale projects, such as gathering rainfall in depressions and pumping it to nearby cropland.