Comparing the PIDs printed, you can see that the original process is the parent process (PID 767), and the child process (PID 768) knows who its parent is.
对所打印的PID进行比较,可以看到原始进程是父进程(PID 767),并且子进程(PID 768)知道其父进程是谁。
Another example is when the original file is very large, and was printed earlier, but certain pages did not print correctly because the printer jammed or had some other problem.
另一个示例是,原始文件很大而且以前已打印过,但某些页面由于打印机卡住或其它原因而没有被正确打印。
Say the image needs to be marked so that if printed, the new document cannot be mistaken for the original archive copy.
比如说,图像需要打上标记,以便打印的时候新文档不会被误认为是最初的归档副本。
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