该实例讨论了从远程系统中读取购物车的用例。
This example discusses the use case of reading a shopping cart from a remote system.
信息高速公路旨在提供远程电子服务，如远程电子存款、远程电子教育、远 程电子购物、远程电子纳税、远程电子游戏、远程电子可是会议、远程电子 租片、远程电子疗诊等等。
The purpose of information superhighway is to provide remote electronic banking, schooling, shopping, taxpaying, game playing, video conferencing, movie ordering, medical diagnosing, etc.
上图显示了在连接表实现中用相同数量的远程调用（即 4 个）来检索整个购物车。
The figure shows that the same number of remote calls, namely four, is used to retrieve the entire shopping cart as in the joined-tables implementation.
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