现在淡水越来越不足，而由于世界人口日益增长，据估计淡水的需要量会越来越大。
Now fresh water is becoming scarce, but it is estimated that more and more will be needed because of the increasing world population.
通过生产节拍估计，计算设备需要量。
Calculate the amount of the equipments, by estimate the line pitch.
内源氨基酸的排泄量是计算饲料真可消化率以及析因法估计动物蛋白质、氨基酸需要量的重要参数。
The excretion of endogenous amino acids is an important parameter in calculating protein true digestibility and in estimating protein and amino acids requirement.
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