除了执行其指令之外，进程有时还会管理打开文件、处理器上下文、地址空间以及与程序相关的数据等。
Apart from executing its instructions, a process might be engaged in managing open files, processor context, address space, and data related to the program, among other things.
在这里必须有一种方式去向对象发出一个请求，在对象收到请求后才能照指令去完成一个事务，在屏幕上打印一些东西，或是打开一个开关。
There must be a way to make a request of that object so it will do something, such as complete a transaction, draw something on screen or turn on a switch.
当你打开你的电脑，微处理器尝试去执行它的第一条指令的时候，它必须从某个地方获得这个指令。
When you turn on your computer and the microprocessor tries to execute its first instruction, it has to get that instruction from somewhere.
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