If you take a look just at water, with four very common products, you look at how much a farmer produced to make those products, and then you look at how much water input was put into them, and then you look at what the farmer was paid.
例えば水を考えてみて下さい ４つの主要生産物から 見て取れるのは どれだけの量を農家の人々が生産したか どれだけの水が使われたか そして どれだけの収入を 農家の人々が得たかということです