通知客户机实际的事件：用户按下某个按键；午夜时钟敲响；风扇停止工作造成CPU烧毁；
To Notify Clients About Real-World Events The user pressed a key; the clock struck midnight; the fan failed and the CPU is on fire.
类似地，如果运行清单4中的runclock3. sh脚本，并在运行脚本的终端窗口中按下Ctrl - c，脚本会立即终止，但是没有关闭时钟。
Similarly, if you run the runclock3.sh script of Listing 4, and press Ctrl-c in the terminal window where the script is running, the script will immediately terminate without shutting down the clock.
当只是瞬间按下OFF按钮时，时钟显示不关闭并会引起电池损耗。
When you press off only momentarily, the clock display does not turn off and this causes battery wear.
当只是瞬间按下OFF按钮时，时钟显示不关闭并会引起电池损耗。
When you press off only momentarily, the clock display does not turn off and this causes battery wear.
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