他连续5年在同一块地上轮流种植不同作物，研究人员称之为轮作。
He grew a different crop on the same field five years in a row, what researchers call crop rotation.
在同一块田地里按一定顺序种植不同作物的耕作方法。
Successive cultivation of different crops in a specified order on the same fields.
换句话说，虚拟水的价值不是提供确切的数据，而是让人们意识到种植不同的作物可能使境况更好，或者把他们的工业转移到其它国家。
In other words, the merit of virtual water is not to give precise figures but to alert people that they might be better off growing different crops, or moving their manufacturing to another country.
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