最后，运用数据包络分析的方法，结合世界上八个国家的虚拟水使用效率，进行了比较分析，同时给出了相关的对策以及建议。
At last, according to the virtual water efficiency within eight countries and DEA (Data Envelop analysis) method, the paper makes compare and analysis and also supplies related measure and suggestion.
农业学家们开始设计工具，帮助监测水的使用效率。
Agronomists are beginning to devise tools to help monitor the efficiency of water use.
芝加哥正努力提高水的使用效率，替换渗漏的管道，安装水表。
Chicago is trying to become more efficient, replacing leaky pipes and installing water meters.
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