Person类仅仅用一个指针来指向某个不确定的实现，这样的类常常被称为句炳类(Handle class)或信封类(Envelope class)。（对于它们所指向的类来说，前一种情况下对应的叫法是主体类(Body class)；后一种情况下则叫信件类(Letter class)。
基于20个网页-相关网页
The tcpmon class writes any SOAP envelope that comes to port 8070 to the tracing window and sends it to localhost port 8080.
tcpmon类把任何发往端口8070的SOAP信封都写到跟踪窗口并将其发送到本地主机端口(localhost port) 8080。
Zimbra has used AjaxTK to push the envelope of what we think of as a Web page by developing a complete online Collaboration Suite, including enterprise-class E-mail, calendar, and contacts.
Zimbra已经使用AjaxTK挑战了我们所谓的web页面的极限，开发出完整的在线Collaboration Suite，其中包括企业级电子邮件、日历和联系人。
For our class, you do NOT have to make an envelope, but you may if you wish.
为我们的阶级，你没有作出一个信封，但你可能，如果你想。
应用推荐