When you deal with a world space system, it's even and isotropic throughout, so you have a well-behaved system that in 3d.
当你处理一个整体空间系统，它始终可以保持平滑和等价，因此你就会在3d里有一个设计很好的系统。
The merit of symplectic system can be applied to arbitrary an isotropic material, and also easier for treating interface conditions between different materials.
辛体系可以用于任意的各向异性材料，而且便于处理不同介质的界面条件。
Because the concrete has the multiple structure and non-isotropic compound materials system, it will present the error through the partial research to the whole method.
混凝土材料是复杂结构的非均质复合材料体系，通过局部的研究对整体的外推就难免出现谬误。
Axisymmetric problem: The state vector equation of transversely isotropic axisymmetric space magneto-electro-elastic media is established in a cylindrical coordinate system.
层状压电压磁弹性材料的空间轴对称问题：在柱坐标下，建立了横观各向同性压电压磁弹性材料空间轴对称问题的状态变量方程。
Major contributions are as follows: All paradox problems in the isotropic elastic wedge are re-solved in analytical forms under a symplectic dual polar coordinate system.
主要的研究成果如下：在极坐标辛对偶体系下重新求解了各向同性弹性楔体所有佯谬问题的解析解。
Major contributions are as follows: All paradox problems in the isotropic elastic wedge are re-solved in analytical forms under a symplectic dual polar coordinate system.
主要的研究成果如下：在极坐标辛对偶体系下重新求解了各向同性弹性楔体所有佯谬问题的解析解。
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