If you have a client/server system, the server should never trust the client.

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。

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Clock synchronization services work by changing the system clock on the client systems to match the clock on the server system.

时钟同步服务通过把客户机系统上的系统时钟改成与服务器系统相匹配的时钟而起作用。

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To prevent some of these simpler attacks, the following client and server implement a simple challenge-response system.

为了避免这样的一些较简单的攻击，以下客户机和服务器将实现一个简单的请求-响应系统。

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In bringing Ubuntu to the phone, Canonical is uniquely placed with a single operating system for client, server and cloud, and a unified family of interfaces for the phone, the PC and the TV.

ENGADGET: Canonical announces Ubuntu for smartphones, we go hands-on (video)