缓慢的结晶过程会给出十分纯的晶体，在光学活性的研究中，这些晶体很可能不需要进行再结晶了。

Slow crystal formation gives quite pure crystals that probably need not be recrystallized for the optical activity studies.

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非晶体硅材料没有硅晶体那样纯，原子间的空隙也小，因而限制了电流的流动。

This material is not as silicon crystals. It has tiny spaces between the atoms that limit the flow of electrical current.

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要解决这个问题，就需制造出更纯的晶体，卡瓦及其他一些科学家正在致力于这一点。

Such problems can be solved by making the crystals as pure as possible, something that Cava and others are working on.

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Last time we reach the third law which is telling us that we can't quite get to zero degrees Kelvin .but that as the temperature approaches zero degrees Kelvin, the absolute entropy of a pure substance in perfect crystalline form is zero.

上次课我们得到了热力学第三定律,这个定律告诉我们我们无法,达到0K的温度,但是在我们接近绝对零度的过程中，以完美晶体形式存在的纯物质的绝对熵,也趋向于零。

麻省理工公开课 - 热力学与动力学课程节选