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Professional Terms
专业术语
operating system
操作系统
exactly adv.
确切的，精确的
involve v.
包含，涉及
logic n.
逻辑
load v.
装入，加载
What exactly does an operating system do? Basically ,it performs a number of supporting functions.
操作系统究竟是干什么的呢？从根本上讲，它施行一些支持功能。
For example, suppose an application program is stored on a disk
例如，假设应用程序存储在磁盘上。
before the program can be executed, it must be copied into the main memory first.
它在被执行前，必须制到主存储器中，
because the program that controls a computer must be in the main memory.
因为控制计算机的程序必须要在主存储器中。
The process of copying a program from disk to memory involves considerable logic.
把程序从磁盘复制到主存的过程涉及重要的逻辑。
The source of a computer's logic is software.
计算机的逻辑源来自软件。
Thus ,if the application program is to be loaded, there must be a program in the memory to control the loading process.
因此，如果要装入应用程序，必须在主存中有一个控制加载过程的程序。
That program is the operation system.
这个程序就属于操作系统。
