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。