思考一下前面所说的 GUI 控制面板；在 Unix 中编写这个程序时，一种高性能的做法是只在 select() 系统调用检测到到达的数据时才更新显示。

Think of the GUI control panel; a high-performance way to program this with Unix is to update the display only when the select() system call detects arriving data.

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首先，在“显示”属性里(控制面板的“显示”栏)，点击“外观”，点击“高级”选项，出现。

First, go to Display Properties (" Display "icon from Control Panel), click the Appearance TAB and then the Advanced button.

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工人使用控制面板上显示的罐子id来找到它，将其移出包装队列，然后在控制面板上确认该罐已移除。

The worker USES the jar ID displayed on the control panel to find the jar and remove it from the packing queue, then confirms on the control panel that it's been removed.

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