科学家预言:二十一世纪战争的根源是水资源的争夺。“缺水”已成为世界性问题。干旱地区缺水自不必说,就连世界上水量最多的国家巴西,也有１０００万人生活在缺水的东部高原地区,为解决缺水问题不得不请外国专家打井。为了解决城镇日益严重的水资源的紧缺状况,人们一方面开发新 Scientists predict: The root cause of the war in the twenty-first century is the scramble for water resources. “Water shortage” has become a worldwide problem. Needless to say, even in Brazil, where most of the world’s water is scarce, 10 million people live in the water-deficit eastern plateau. Foreign experts are forced to dig wells in order to solve the problem of water shortage. In order to solve the increasingly serious shortage of water resources in cities and towns, people are developing new ones