一个过时的成分或元素是指那些不会保证得到用户代理的支持。

An obsolete element or attribute is one for which there is no guarantee of support by a user agent.

在HTML 4表模式允许作者标签每个细胞，使非可视用户代理可能更容易沟通，标题资讯细胞给用户。

The HTML 4 table model allows authors to label each cell so that non-visual user agents may more easily communicate heading information about the cell to the user.

在SIP用户代理之间建立多媒体会话的实现基于开源的SIP协议栈.

Implementation of creating multimedia sessions between SIP UAs is based onOpen Source SIP protocol stacks.

但是，针对于非浏览器、非桌面大小的用户代理，HTML5在与浏览器更为平等地相待方面做出了很多的改变。

HTML5, on the other hand, has a good number of changes to put non-browser, non-desktop-size-screen user agents on more equal footing with traditional Web browsers.

可以担当用户代理客户端和服务器端的逻辑实体.

A logical entity that can act as both a user agent client and user agent server.

表示用户代理可以自行折中更新速度和资源分配的比例。

Auto: Indicates that the user agent is expected to use a reasonable compromise between speed of update and resource allocation.

作者也可列小组提供更多的结构信息，可利用的用户代理。

Authors may also group columns to provide additional structural information that may be exploited by user agents.

列团体转达额外的结构信息和可能作出的用户代理的方式，强调这一点的结构。

Row groups convey additional structural information and may be rendered by user agents in ways that emphasize this structure.

HTML5规范终于引入了精确解析规则，并定义了像用户代理遭遇解析错误时应该做的事情。

The HTML5 specification finally introduces precise parsing rules and defines things like what the user agent should do when it encounters a parsing error.