Why do food prices keep on rising, when there seems to be much more food? Is the abundance only temporary, or has it come to sta

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问题 Why do food prices keep on rising, when there seems to be much more food? Is the abundance only temporary, or has it come to stay?

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答案为什么一方面粮价不断上涨,另一方面粮食似乎很充裕?粮食充裕是不是只是暂时的,或一直是这样?

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