Just as significant , we saw the importance of using a data transfer object now being called an sdo and custom methods on entity ejbs to minimize the chattiness between layers , even when the local interface is used 更有意义的是，我们看到了在实体ejb上使用数据传输对象（现在称为sdo ）和自定义方法的重要性，其最小化了不同层之间的隔阂，即便在使用本地接口的时候也是这样。
We introduced some characteristics of service - oriented architectures ; for example , to minimize the chattiness between a service and its client , the service must be coarse - grained , stateless , and must normally assemble a data transfer object that collects all the properties returned to the client application 中，我们介绍了面向服务的体系结构的一些特征；例如，为了尽可能减少服务和其客户机间频繁的对话，服务必须为粗粒度的无状态服务，而且必须正常组装数据传输对象( dto ) ，此类对象会收集所有从客户机应用程序返回的属性。
I agree with you that they are especially important in the services layer , where you want coarse - grained methods , especially for facades representing services that hide implementation , and especially for remote facades since a remote invocation is much more expensive than a local one 我同意您所说的，数据传输对象在服务层（该层中需要各种粗粒度方法）非常重要，特别对于表示隐藏实现的服务的外观，尤其是远程外观（因为远程调用的开销要比本地调用大得多）更是如此。
