如果您有一个客户机/服务器系统，服务器应该永远不要相信客户机。
If you have a client/server system, the server should never trust the client.
环境中的客户机只知道前端的代理服务器，代理服务器背后的服务器集群对于客户机是隐藏的，客户机会看到统一的目录视图。
Since the clients in the environment are only aware of the front-end proxy server, the server cluster behind the proxy server remains hidden and a unified directory view is presented to the client.
想一想执行远程方法调用的机制，您就会发现定义参数传递的方向(客户机到服务器、服务器到客户机或者双向传递)是多么的有意义。
If you think about the mechanics of making a remote method call, it makes perfect sense to define the direction that the parameters will be moving in — client-to-server, server-to-client, or both.
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