There's a high energy cost in switching from a regular metabolism to an almost-no-water metabolism.

从常规的新陈代谢转换为几乎无水的新陈代谢会消耗大量的能量。

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They lack water-storing structures, and their existence on rock faces prevents them from tapping groundwater, so they have instead developed the ability to change their metabolism.

它们缺乏储水结构，而且它们长在岩石表面，这阻止了它们利用地下水，所以它们反而形成了改变新陈代谢的能力。

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Such an environment would have to contain the basic ingredients of life-including water, organic carbon and a source of energy to sustain the microbes' metabolism.

这样的火星环境也许包含了一些基本的生命要素——包括水，有机碳和维持微生物新陈代谢的能量源。

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Nanoscale materials are being used to address current drug delivery shortcomings, including water solubility, ADME (absorption, distribution, metabolism, and excretion) and toxicity.

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In addition, make sure that you drink plenty of water, as being even 1 percent dehydrated can drop metabolism significantly.

CNN: What's the best way to 'kick-start' my metabolism?