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%。

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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%。

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