这个抽象的方面，叫做Trace，有几种标准程序来打印关于输入和退出一个程序，或构造方法的信息以及格式化输出的结果。
This abstract aspect, called Trace, has several standard methods for printing messages about entering and exiting a method or constructor, and for formatting the output.
设备驱动程序每一个设备，如鼠标或打印机连接到计算机系统，有一个特殊的程序，与它相关的。
Every device, such as a mouse or printer that is connected to a computer system has a special program associated with it.
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