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英语翻译While the front end is simple enough,the back-end proces

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英语翻译
While the front end is simple enough,the back-end processing used to handle the request is a little complicated.When a request first reaches the UPS site,it is handled off to one of a handful of Web servers.The particular server that is selected depends on a variety of factors such as the current load on the various machines.Next,the selected server passes the request to the appropriate application server.In this case,the application is tracking.From there the application server passes the request to an IBM AS/400 computer,which is attached to the UPS tracking database.Actually,this database is the largest transaction database in the world and contains over 15 terabytes of data.The mainframe actually does the database search for the status information associated with the tracking number.Once the information is found,it is passed back up the line through the various servers to the customer’s browser.
尽管前段已经足够简单了,后端的处理还是有一定的复杂程度的.当请求首先到达UPS时,会挂起Web服务.这个被选择的特别的服务器受多个因素的制约,比如不同机器的流量负载.另外,被选择的服务器传递请求给合适的程序处理服务器.在这个情况下,程序在跟踪.从这里程序服务器传递请求给一台IBM AS/400计算机,此机联系着UPS跟踪数据库.实际上,这个数据库是世界上最大的传输数据库,包括超过15terabtes数据.这框架实际上是为跟踪数据信息作数据分析的.一旦信息被找到,就会通过不同的服务器被传给用户端的浏览器.