By constraining the type parameter , you increase the number of allowable operations and method calls to those supported by the constraining type and all types in its inheritance hierarchy 通过约束类型参数，可以增加约束类型及其继承层次结构中的所有类型所支持的允许操作和方法调用的数量。
The author has analyzed and compared several main cases of boundary constraints thoroughly , furthermore , mathematical modeling and error analysis of the most complex boundary constrains case has been lucubrated 文章对八种主要的边界约束类型做了深入的分析比较，并着重对最复杂的边界约束情况的数学模型建立、求解及误差分析展开了细致和详尽的讨论。
The experimental numerical solution verifies the correctness of the geometry solution . the analyzed template is more typical than the other templates in the former literatures because it includes not only the constraints appeared in the before literatures , but also the angle constraints between the unknown geometry elements never discussed before 该模板问题既包含了一些已经被研究过的约束类型，而且还包含了从未研究过的未知几何元素间的角度约束，因此对该问题的讨论更加具有代表性，文中还给出了相应的数值解，验证了几何推导的有效性。
