结论：通过CT断层扫描、图像数字化处理及计算机辅助设计等方法，可以建立腰椎人工椎间盘置换的有限元模型，用于脊柱生物力学的进一步研究。
CONCLUSION: the finite element model of artificial disc replacement can be established by CT scanning, digital processor and computer aided design, and used for further study on spinal biomechanics.
置换材质用于增加细节，它只用在观察者周围的有限地形中。
A displacement texture is used to add details and it is applied only to the piece of terrain surrounding the viewer.
公司通过资产置换置入中汽成都配件有限公司90%股权而进入汽车配件制造行业。
Replacement of assets placed through Medium Steam parts Co., Ltd. Chengdu 90% equity into the auto parts manufacturing industry.
目的建立人工髋关节置换术后的三维有限元模型，分析研究人工股骨柄、骨水泥和人体股骨的应力分布。
Objective a three dimensional finite element model after total hip replacement was established to analytically study the stress distribution of the artificial stem, bone cement and human femur.
把有限集中的置换推广到可数集上，引入基轮换、轮换及变换的可数次合成等概念的定义。
The permutation of the finite set is introduced into the denumerable set as well as the definition of the basic rotation, the rotation and the composition of the countability.
利用有限域上一般线性群的BN对分解，给出有限域上的可逆矩阵在置换阵相似变换下的标准形。
We got the standard form of nonsingular matrix over the finite field by means of BN pair decomposition under the similarity transformation of the permutation matrix.
目的：建立腰椎运动节段人工椎间盘置换的有限元模型，用于进一步的生物力学研究。
OBJEC TIVE:To establish finite element model of lumbar disc replacement for biomechan ical studies.
与在向量空间上构造的方法比，有限域上置换多项式的代数次数等性质更容易研究。
Compared to the construction over vector space, it is easier to study the properties of permutation polynomials, like algebraic degree.
结果与结论：建立了表面髋关节置换术后三维几何和有限元模型。
RESULTS AND CONCLUSION: The three-dimensional geometry and finite element model of surface hip arthroplasty was established.
建立起表面髋关节置换术后的三维有限元模型。
So the three-dimensional finite element model of surface hip arthroplasty was established.
因此，有限域上的置换多项式一直是一个重要的研究课题，关于这一课题的研究至少有140年的历史。
Hence the research on permutation polynomials has been an important subject for at least 140 years, especially from 70s of the last century for the necessary of the study of cryptography.
因此，有限域上的置换多项式一直是一个重要的研究课题，关于这一课题的研究至少有140年的历史。
Hence the research on permutation polynomials has been an important subject for at least 140 years, especially from 70s of the last century for the necessary of the study of cryptography.
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