操作系统可以快速执行和响应程序，对计算机用户来说，这个执行过程难以被注意到的(因为太快了)。这也让我们觉得，操作系统好像同时执行了多道程序。
The operating system can allow execution of multiple programs so quickly that it is virtually unnoticeable to a human user, making it seem as all the programs are running at the same time.
多道程序设计的价值是在相同的时间总量内能执行更多的程序。
The value of multiprogramming is that more programs can be run in the same amount of time.
多道程序设计的价值是在相同的时间总量内能执行更多的程序。
The value of multiprogramming is that more programs can be run in the same amount of time.
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