困难的问题是，仍在等待怎样获得与蒸散而损失的水相对应的食用作物产出。
The difficult problem that still awaits an answer is how to get higher yields from food crops without a commensurate rise in the loss of water through evapotranspiration.
困难的问题是，仍在等待怎样获得与蒸散而损失的水相对应的食用作物产出。
The difficult problem that still awaits an answer is how to get higher yields from food crops without a commensurate rise in the loss of water through evapotranspiration.
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