英文：A homogenous solid formed by a repeating, three-dimensional pattern of atoms, ions, or molecules and having fixed distances between constituent parts.
中文：晶体一种由原子、离子或分子作重复和立体型排列而形成的均质固体，在组成部分之间有固定的距离
英文：A set of eight valence electrons in an atom or ion, forming a stable configuration.
中文：八重态在一个原子或离子中，形成稳定组态的一组八个化合价电子
英文：A crystal defect caused by the absence of an atom, an ion, or a molecule in a crystal lattice.
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