即使在此次粮价开始上涨的两年前，食品援助已处于历史较低水平，以实值计算或许只有二十年前的一半。

Even before the current price boom started two years ago, food aid was running at historically low levels, perhaps half the real-terms total of two decades earlier.

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每个Reference元素都包括摘要方法和对已识别资料资料物件计算得出的摘要值。

Each Reference element includes the digest method and resulting digest value calculated over the identified data object.

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克立格法是三维空间插值的主要方法之一，目前已广泛应用于矿体储量计算过程中。

Kriging is one of the three dimensional interpolation methods and is now widely used in orebody reserve calculation.

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