所以它是三角形金字塔。
A trigonal bipyramid has three equatorial and two axial positions.
一个三角双锥体有三个赤道位和两个轴向位。
The tin atoms are five-coordinated with geometry of distorted trigonal bipyramid.
两个锡原子为五配位的三角双锥构型。
The third chapter investigated the elasticity problem of one dimensional trigonal QCs.
第三章研究了一维三方准晶的弹性问题。
A new calculating method has been proposed for the elongation and twist of trigonal prism.
建立了一种新的三棱柱配位结构伸缩变形和扭曲变形的计算方法。
A method of obtaining the pure mode direction of the trigonal system by the slowness surfaces is introduced.
本文介绍了一种利用慢度曲面判断三方晶系晶体纯模轴的方法。
This reflects the change of the crystal-habit of the trigonal trapezohedron simple form in synthetic smoky quartz.
这种变化反映了人工烟水晶三方偏方面体单形结晶习性的变化。
In the crystals of the complex, the tin atoms are penta-coordinated in a distorted trigonal bipyramidal configuration.
在该配合物的晶体中，锡原子呈五配位畸变三角双锥构型。
Both endo-cyclic and exo-cyclic tin atoms are five-coordinated and have coordination geometry of distorted trigonal bipyramid.
内环锡和外环锡原子均为五配位的畸变三角双锥构型。
By Evjen crystal cell, the calculation formula about Madelung constant for the two-dimensional trigonal ion crystal was deduced.
采用埃夫琴晶胞推导了计算二维三角离子晶体的马德隆常数的通项公式。
The relation between the stress along the optical axis of trigonal crystallographic system and the refractive index is established.
运用折射率椭球分析晶体的弹光效应，给出了三方晶系沿光轴方向的应力与折射率的变化关系。
In the molecular structure of complex (4), Sn atoms are five-coordinated and present the distorted trigonal bipyramidal geometry structures.
配合物(4)中的锡原子为五配位，构成以锡原子为中心扭曲的三角双锥构型。
So it's trigonal because we have these three atoms that are bound to the central atom here, and if you picture it, it's actually shaped like a pyramid.
这里三角形是因为,我们有3个原子核中心原子成键，如果你画它，它就是金字塔形的。
The grey cluster model with fixed weights is introduced, then a new evaluation model based on trigonal whitenization weight function is formulated.
在灰色定权聚类模型的基础上，提出了一种基于三角白化权函数的评估模型。
Color ring and a level section of A. H. Munsell color solid were analysed with regular triangle. Schemes for trigonal color design suitable for furniture design were suggested.
通过正三角形分析色环及孟赛尔色立体水平剖面，寻找三角色设计的配色方法，并应用于家具设计中。
The crystal structure has been determined by X ray single crystal diffraction, showing a distorted trigonal bipyramidal configuration with five coordination for the central tin atom.
通过元素分析、 红外光谱和氢核磁共振谱对其结构进行了表征。用X-射线单晶衍射测定了该化合物的晶体结构。
The temperature field and warming process of the transient and steady state in the laser rod by symmetrical trigonal side-pumping were simulated using the finite element analysis method.
用有限元法计算模拟了三角均匀分布侧面泵浦结构激光棒瞬态温升过程及稳态温度分布情况。
The utility model provides a trigonal pencil which consists of a pencil core and a pencil body, and is characterized in that the trigonal pencil body is arranged on the periphery of the pencil core.
本实用新型提供一种由铅笔芯和铅笔体组成的三棱 铅笔，其特征是：在铅笔芯外围设置一三棱柱形铅笔体。
The utility model provides a trigonal pencil which consists of a pencil core and a pencil body, and is characterized in that the trigonal pencil body is arranged on the periphery of the pencil core.
本实用新型提供一种由铅笔芯和铅笔体组成的三棱 铅笔，其特征是：在铅笔芯外围设置一三棱柱形铅笔体。
应用推荐