通过观察存在于极端环境下的生物，研究人员发现液态水只能在有限范围内的温度和压力下供生物使用这些发现会让科学家对外太空生命的搜寻集中到太阳系来。 莱恩威弗说：“我们猜想在地球上找到的这些限制条件是限制所有以水为支撑的生命的基础。”

After compiling observations of life in extreme environments, the researchers found that liquid water in only a limited range of temperatures and pressures can support life.

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这些零件仅仅用在受限制的条件下，诸如某些温度不能超过一定的限值，而且它们也只能用在这些特殊的条件下。

Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specified limits, and shall be used only under those specific conditions.

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所有AWWA钢管涂层标准都按照饮用水的最高温度指定，但是业主仍需要咨询厂家的涂层条件和限制。

All AWWA steel pipe coating standards are based on the maximum service temperature of potable water. The purchaser shall consult the coating manufacturer for conditions and limitations.

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