Crystal, any solid material in which the component atoms are arranged in a definite pattern and whose surface regularity reflects its internal symmetry.
晶体（Crystal）是指内部质点(原子、离子或分子)在三维空间周期性地重复排列构成的固体物质。这种质点在三维空间周期性地重复排列也称格子构造，所以，晶体就是具有格子构造的固体。
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