Dr Corson's models show, however, that this inefficiency is true only if demand for water and the nutrients it contains is constant.

然而，科森博士的模型表明这种低效只有在对水和包含营养素的需求恒定的情况下才能发生。

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True bread is flour and water with a pinch of salt and yeast.

正宗的面包是面粉加水，和少量盐及发酵粉制成的。

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Many urban farmers, it is true, simply tap local rivers for their water.

当然事实上，也有很多城镇的农民直接使用当地的河流作为他们的灌溉水源。

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Pan's group looked for novel mechanisms and materials to build a true water-striding robot.

ENGADGET: Chinese microbot walks on water, skims the surface of insect-inspired design

It is, though, a true water cooler moment, and certainly memorable.

BBC: Water on the brains

For starters, consider the fact that the degree of market failure varies from region to region: the difference between the price of water and its true marginal cost must be higher in dry places than wet ones.

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