如果你的家庭作业涉及到上网，而你没有自己的电脑，那么一定要在家庭电脑上“预定”一些时间，或者可以在学校图书馆使用一台。
If your homework involves going online and you don't have your own computer, make sure you "book" some time on the family computer, or can use one in your school library.
通常，当您不在计算机附近时，一般使用cron和at实用程序运行命令，这些程序通常会认为预定的作业不能访问播放器的图形化表示。
Normally, you run commands with the cron and at facilities at some point when you may not be around, so the usual assumption is that these scheduled jobs do not have access to a display.
为了简便、高效和灵活性，作业提交用户界面允许您通过个别目标名称或预定义的目标组来指定目标。
For simplicity, efficiency and flexibility, the job submission user interface permits you to specify targets by individual target names or by predefined groups of targets.
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