We can be conveniently studied with reference to a crystal of calcite or Iceland SPAR.
我们可以很方便地以方解石或冰洲石晶体来进行研究。
What you saw were the crystal extractors, and, because you have no frame of reference for such things, your mind translated it into third-dimensional terminology.
你看到的是水晶提取，因为你对这些事没有参考的架构，你的心智把它翻成三次元的术语。
The criterion will supply a theoretical reference for realizing the mechanism of crystal growth and obtaining the crystal structures needed.
此判据将为了解晶体生长方式及获得所需晶体组织提供理论参考。
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