设置的过程与地面物体的创建相似，只不过需要为动态物体定义额外的一些属性。
This setup is similar to the creation of the ground body, except that you define additional attributes for the dynamic body.
这还允许在服务器上动态应用策略，而不是必须在开发过程中使用部署描述符定义策略。
This also enables policies to be applied dynamically on the server instead of having to define them during development using deployment descriptors.
对于希望修改类而不触及源代码，或者希望在运行时动态修改类定义的开发人员，这个过程可以实现多种用途。
This process has a variety of USES for developers who want to modify a class without touching the source, or want to change the class definition dynamically at run time.
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