针对这个问题该文基于人机交互中的笔交互技术，设计并实现了一套几何教学系统，并将双向几何约束的相关技术应用于该系统中。
To solve this problem, this paper designs and implements a geometric teaching system based on PUI (Pen User Interface), and applies technique of bidirectional geometrical constraint to this system.
首次利用约束热处理结合热机械训练获得了加热伸长、冷却收缩的双向记忆效应弹簧，其伸长率达60%。
A TWSME extension spring, which can extend upon heating and contract upon cooling was obtained using constrained annealing and thermo-mechanical training, the elongation can reach 60%.
同时，分析了双向组合板在不同约束条件和不同跨度比下的受力性能。
At the same time, performance of two-way composite slab with different boundary conditions and different span-ratio are analyzed.
其次，利用加强顺序约束和遮挡约束的双向动态规划方法来处理遮挡；
Secondly, a bidirectional dynamic programming method enforcing ordering and occlusion constraints was used to handle occlusions;
介绍了高强约束混凝土异形截面双向压弯构件承载力的计算方法，计算机分析方法、强度校核法及图表法，可用于工程设计。
This paper introduced calculate methods for non-rectangular confined high-strength concrete columns of load-bearing capacity, which can give reference to engineering design.
该机构采用双向绝对约束排绳原理，排绳安全可靠、效率高，也是同类卷扬吊挂机械最为理想的排绳结构之一，具有推广价值。
It can also be used in the similar hoisting equipment as one of the best rope guiders and is worth promoting.
该文以铅作为试验材料，测定单向压缩有限变形和双向受约束两种情形下的载荷位移曲线，建立了基于欧拉描述的铅有限变形本构方程。
The keypoint to simulate the metal forming process by using finite deformation theory is to define the constitutive equations of the material.
该文以铅作为试验材料，测定单向压缩有限变形和双向受约束两种情形下的载荷位移曲线，建立了基于欧拉描述的铅有限变形本构方程。
The keypoint to simulate the metal forming process by using finite deformation theory is to define the constitutive equations of the material.
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