遗憾的是，当许多这样的系统消失时，其中的操作系统也随之消失。
Unfortunately, when many of these systems pass, their operating systems pass along with them.
按钮，并使用您操作系统的有效用户替换其中的值。
Button, and replace the value with a valid user of your operating system.
在操作系统课程的教学中，进程同步是其中一个重点，也是难点。
Process synchronization is an emphasis and difficulty in the teaching of operating system course.
在操作系统课程的教学中，进程同步是其中一个重点，也是难点。
Process synchronization is an emphasis and difficulty in the teaching of operating system course.
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