访问服务层可以将后端编程模型和API向外扩展到客户端。
The access services layer extends backend programming model and APIs out to the client.
如果模型服务是当作 EJB 层来实现的，那么其性能会得到非常显著地增强。
This gives a particularly marked performance boost if the Model service is implemented as EJB Layers.
该应用程序服务层驻留着适合SaaS模型的应用程序。
The application services layer hosts applications that fit the SaaS model.
应用推荐