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：晶體一種由原子、離子或分子作重複和立體型排列而形成的均質固體，在組成部分之間有固定的距離
英文：A set of eight valence electrons in an atom or ion, forming a stable configuration.
中文：八重态在一個原子或離子中，形成穩定組态的一組八個化合價電子
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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