编译、连接、运行，打开电子时钟窗口。

Compile, link, run, electronic clock to open the window.

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窗口是在客户端时钟和服务器时钟之间所允许的最大偏差。

The window is the maximum allowable drift between the client clock and the server clock.

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从消除信号阻塞到进程执行下一个指令之间，必然会有时钟周期间隙，任何在此时间窗口发生的信号都会丢掉。

There has to be some gap of clock cycles between the unblocking of signals and the next instruction carried by the process, and any occurrence of a signal in this window of time is lost.

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