数据从NWS服务器流动到我的服务器，服务器端脚本将xml转换为HTML。
Data flows from the NWS server into my server, where the server-side script converts XML to HTML.
在这些不同服务器之间流动的信息可能经历多次字符转换，而且大多数情况下，这些转换对用户是透明的。
The information that flows between these various servers may go through several character conversions, and in most cases these conversions are transparent to the user.
箭头表示活动之间的转换，各种活动之间的流动次序。
The arrows represent transitions between activities, modeling the flow order between the various activities.
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