水是地球上唯一的可变的固体，气体和液体元素。
Speaking first in generalities, suppose we have a collection of atoms, as for example, in a solid , gas or liquid.
一种元素到底属于固体、液体还是气体，要视其原子之间的相互作用而定，但它们与其它物质(如金)之间的相互作用，可相当于前一相互作用的“代理方式”。
Whether an element is a solid, a liquid or a gas depends on how its atoms interact with each other. But how they interact with other substances, such as gold, ACTS as a proxy for that behaviour.
如果2005年我们通过卡西尼探测器在土卫二南极地区发现的冰晶喷泉，实际上是土卫二内部的液体水从土卫二逃逸的出口。那么这些冰晶喷泉也许就是现在被发现的钠元素的起源地。
If the source of Enceladus' south polar geysers, discovered by Cassini in 2005, is indeed liquid water, then the geysers will transport the dissolved sodium into space.
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