... 对称要素 symmetry elements 原子堆积因数 atomic packing factor(APF) 面心立方结构 face-centered cubic (FCC) ...
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The "hat" distinguishes symmetry operations from symmetry elements.
“帽号”用来将对称操作与对称元素区别开。
The geometric structure of carbon nanotubes (CNTs) is introduced, the symmetry of zigzag and armchair CNTs is analyzed and these symmetry elements are abstracted and summarized.
在讨论了碳纳米管的几何结构的基础上，对齿型和椅型碳纳米管的对称性进行了分析并将这些对称元进行了抽象和总结。
Note that even though these two design elements (and a few more throughout the site) add visual interest, they still balance each other out to maintain symmetry in the design.
需要学习的是，虽然个别的几个设计元素增强了视觉效果，但在设计上它们依然保持对称以达到平衡。
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