农业用水效率较低。
在今天的中国，农业用水的利用效率约为30%-40%。
In China today, the utilization efficiency of farming water is about 30-40 percent.
世界粮农组织认为，如果用水效率不加以改观，世界对农业的水需求要增加60%，才足够喂养多出的20亿张嘴巴。
The Food and Agriculture Organisation reckons that, without changes in efficiency, the world will need as much as 60% more water for agriculture to feed those 2 billion extra mouths.
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