水,将是21世纪最稀缺的资源。今年3月22日,联合国确定“世界水日”主题为“水与发展”,我国则确定“中国水周”主题为“以水资源的可持续利用支持经济社会的可持续发展”。素 Water, will be the scarcest resource in the 21st century. On March 22 this year, the United Nations set the theme of “World Water Day” as “water and development.” China has set the theme of “China’s water week” as “supporting the sustainable economic and social development with the sustainable use of water resources.” Prime