crystal: n.1.结晶，(结)晶体；晶粒；水晶(＝rock crystal)；石英。2.【无线电】晶体。3.结晶玻璃；雕玻璃；〔美国〕水晶玻璃。4.〔诗〕水晶一样的东西〔冰、水、泪、眼睛等〕。5.〔俚语〕神秘的征兆；预言，占卜。6.〔美俚〕厕所。短语和例子eyes as clear as crystals 一双眼睛明如秋水。 a necklace of crystals 水晶珠项链。
In most crystal systems and in laminated materials the number of components of the thermal conductivity is less than six . 在大多数晶系和层状物质中，热导率的分量数小于6。
2.
Tetragonal crystal system 四方晶系
3.
Having as many planes as required for complete symmetry in a given crystal system 全面的，全对称晶形的具有在给定的晶体系统中全面对称的全部平面的
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Computer programming realization of the projection figure of pole point on equator plane of cubic crystal system plane 面极射赤道平面投影图的计算机实现
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In most crystal systems and in laminated materials the number of components of the thermal conductivity is less than six 在大多数晶系和层状物质中，热导率的分量数小于6 。
6.
In chapter two we analytically study the nonlinear lattice effects for the ground state of electron - phonon interaction one - dimensional molecular crystal system 第二章用解析方法研究一维分子晶体电子-声子耦合系统基态中晶格非线性效应。
