四面体的

The structure consists ofpolyborate groups 〓 and four crystallographically independent Y positions, ofwhich two positions are on inversion center and the other two are on general positions.

中的硼酸根离子为三个四面体构成的〓基团，结构中存在有四种不同的Y原子格位，其中两种Y格位具有中心对称，另外两种Y格位没有对称中心。

EPR study of the thermal products of these montmorillonites shows that g = 2. 14 signal relates with hydrated copper ions existing in the interlayer of montmorillonites and g = 2. 07 signal relates with Cu~(2+) occupying the ditrigonal cavities of Si-O sheet. And, the supper fine line of g ca. 2. 2 - 2. 7 suggests Cu~(2+) migrating into octahedral vaeancies.

同时，该蒙脱石热处理产物的EPR研究表明、g=2.14信号与蒙脱石层间的水合铜离子相关， g=2.07信号和g为约2.7-2.2超精细结构线分别与进入了粘土矿物Si-O四面体片复三方形孔洞和铝氧八面体空位中的Cu相关。

EPR study of the thermal products of these montmorillonites shows that g=2.14 signal relates with hydrated copper ions eXisting in the interlayer of montmorillonites and g=2.07 signal relates With Cu,occupying the ditrigonal cav- ities of Si-O sheet.And,the supper fine line of g ca.2.2-2.7 suggestrs CU migrating into octahedral vacancies.

同时，该蒙脱石热处理产物的EPR研究表明、g=2.14信号与蒙脱石层间的水合铜离子相关， g=2.07信号和g为约2.7-2.2超精细结构线分别与进入了粘土矿物Si-O四面体片复三方形孔洞和铝氧八面体空位中的Cu相关。

By amending the auxiliary geometric primitive,diagonal,of generalized tri-prism into tetrahedron ,the inconsistentness of data organization and of geometric primitive in real 3D geosciences modeling as well as the geometric interstice in spatial operation were solved.

将广义三棱柱的辅助几何要素———对角线———修正为四面体，解决了R3DGM中数据组织与几何要素的不一致和空间操作中的几何裂缝问题。

Chromatographic fingerprint index F and chromatographic fingerprint relative index Fr were used as the objective functions for the evaluation,and the extract of Saussurea involucrate by water was used as the sample.

以色谱指纹图谱指数F和色谱指纹图谱相对指数Fr作为评价毛细管电泳分析系统的目标函数，以雪莲药材水提取液为样品，考察一定浓度的硼砂、硼酸、磷酸氢二钠和磷酸二氢钠溶液按三角形优化法和四面体优化法构成背景电解质时对样品的分离情况，通过添加有机改性剂和调节pH进行再优化。

Both of the methods can be used in the isocratic elution of normal temprature in HPLC, and can be used to two, three and four members mobile phase.

利用可视化的编程语言Visual Basic6.0，编写四面体法和单纯形法的计算机优化软件，实现了流动相优化的自动化。

Topological structure: The mesh topological data are used to depict the space geometric shape, namely, the topological structure formed by several mesh units constructed by a certain connection order. They have types of points, line-segments, triangles, polygons, tetrahedrons, hexahedron, pyramids and cuneate shapes.

拓扑结构：网格拓扑数据是用来刻画数据分布区域的空间形状，即若干网格单元按一定的连接顺序所构成的拓扑组织，其类型有点、线段、三角形、多边形、四面体、六面体、角锥体和楔形等。

When Tenen broke the first word of Genesis into its 'subatomic particles'(the word is actually comprised of two smaller words, meaning "fire" and "six-edged thorn"), he took the "thorn" to mean a tetrahedron and constructed a model of it, placing the "fire," or torus "vortex" form, inside.

当特纳把创世纪的首个单词拆分成&亚原子粒子&（这个词事实上是由两个较小的单词组成，意思分别是&火&和&六角形&），他用&角&这个词来代表一个四面体，并且为它建立了模型，把&火&，或者是花托状的&旋涡&放在里面。

It shows a novel type of layered structure, where dimers of distorted {CuO4} planes are connected by {CPO3} tetrahedra, forming an inorganic layer containing 4-, 8- and 14-member rings.

该化合物具有新型层状结构，由扭曲平面结构的{CuO4}共边形成的二核单元通过{CPO3}四面体连接起来，形成一个含有4-，8-，和14-元环的无机层。

Quantitative analysis of the EXAFS spectra showed that the microscopic structure of Znon anatase TiO2 is four coordinate complex, and there are at least two types of bonding based on the average Ti-Zn distances in the second sphere. Two different geometry configurations of single-corner and double-corner for adsorption on the (101) surface cluster were calculated using DFT method.

EXAFS结果表明，Zn在吸附时由自由水合状态下的Zn-O六配位八面体结构向四配位四面体结构转化，中心Zn原子的第二配位层存在两种不同的Zn-Ti距离（R1=0.371和R2=0.332nm）。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了