在传统二维系统中，一般用二维符号来表述。
In traditional 2D system, they are usually showed by 2D symbols.
有许多生产者的低端二维系统，其中包括了一些免费的开放源码程序。
There are many producers of the lower-end 2D systems, including a number of free and open source programs.
针对非线性离散动态大系统最优控制问题，在二维系统理论的基础上，对一种基于模型求解实际问题最优解的递阶算法作了分析。
Based on two -dimensional system theory, an analysis of a hierarchical optimal control algorithm for discrete nonlinear large - scale system is made.
应用中心流形理论将二元机翼颤振这一四维系统降为二维系统，用后继函数判别法对分叉点的真假中心及稳定性问题进行了分析。
The type and stability of the bifurcation points in the subsequent reduced two dimensional system are analyzed by the method of succeeding function.
结果表明：电子-声子耦合达到一定强度时声学极化子有效质量发生突变而使极化子自陷，声学极化子在二维系统中比三维条件下更容易自陷。
The results indicate: the effective mass of an acoustical polaron undergoes a sudden increasing when thee-p coupling constant achieves the critical value and then the self-trapping occurs.
在三维系统中实时渲染二维图层是实现紧密型二三维结合GIS的关键。
Rendering 2d GIS layer in 3d environment is the key problem of realizing compact type of the two and three dimensional integration GIS system.
在三维系统中实时渲染二维图层是实现紧密型二三维结合GIS的关键。
Rendering 2d GIS layer in 3d environment is the key problem of realizing compact type of the two and three dimensional integration GIS system.
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