在面向对象的有限元程序设计中利用类的继承机制和多态性，可以建立具有共同关键特征的对象家族，实现代码的重用；
In the object-oriented finite element program, utilizing the inheritance and polymorphism may establish the object family that has the same key features, and can achieve the reuse of the code.
作者结合三维实体单元模型，介绍如何对其进行面向对象的非线性有限元程序设计。
Based on the three-dimension solid element, how to design for Object-Oriented nonlinear FEM Program.
面向对象的有限元程序设计可以大大提高程序的模块化和代码的重用性。
Object - oriented finite element programming can greatly improve the code modularity and reusability.
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