第四章介绍如何利用面向对象的方法建立船舶结构的三维实体模型，同时给出相关的数据结构；
The fourth chapter tells how to build 3D solid model for hull structure applying the oriented object technology, furthermore, the corresponding data structures are presented.
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.
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