但是脱盐仍然很贵，尤其是从能源消耗方面来看，这也是为什么脱盐在目前只提供世界0.4%的淡水。

But it is still expensive, especially in terms of energy use, which is why at present it provides only 0.4% of the world's fresh water.

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在一定时间范围内，科学家们已经可以准切的指出该地区每周的天气变化，而这也是到目前为止测绘出的最精确的气象历史。

In some stretches, the scientists were able to pinpoint what the region's weather was like from one week to the next — by far the most detailed climate history ever produced.

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不过我们可以重新计算这些数字，来看看圣诞老人的工作用目前所知的技术能否在限定的时间内完成；这也是件蛮有趣的事。

Nevertheless, it is interesting to rework the calculations to see whether Santa's task really can be accomplished within the allotted time using known technology.

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