Li's stone is a rock crystal of water gallbladder. The reason why the impurities can move is that the original liquid left in it before it became crystal rock has capacity to move from side to side.
据检测，李先生的这块石头是“水胆水晶石”，里面的杂质因在结晶时留下的“原液”形成了“转动”效果。
The arrangement of water molecules in an ice crystal leaves small interstices, whereas the water molecules in liquid water are statistically cheek-to-jowl.
水分子在冰晶里的排列留下许多小空隙，而在液体水里，从统计学意义上讲，水分子们紧密地一个挨着一个，没有空隙。
On its way down, it encounters millions more drops of water. The ice crystal gets bigger as the droplets in the cloud give their water to it.
在下落过程中，冰晶同时也会和上千万的水滴接触，后者的水分会使晶体体积越发增大。
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