图 1 中引入的一个重要组件是客户端存根（stub）。
One of the import components that's introduced in Figure 1 is the client stub.
这种设计模式在中间层中引入了一个应用程序服务器，中间层代理客户端和数据层之间的代理。
This design pattern introduces an application server in the middle tier which brokers connections between clients and the data tier.
元数据概要由 HTML 4引入，其目的是为了让作者向客户端提供一种或多种文档查看或分类的方法。
Metadata profiles were introduced in HTML 4 to allow an author to provide clients with one or more ways of categorizing or viewing a document.
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