什么又是虚拟水？
This approach is complemented by the concept of "virtual water".
“虚拟水”的概念是对这一手段的补充。
Virtual water or hidden water is a complex concept which not many people know about.
虚拟水或者隐含水是个复杂的概念，没几个人明白。
Virtual water or hidden water is a complex concept which not many people know about.
虚拟水或者隐含水是个复杂的概念，没几个人明白。
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