操作系统怎么知道什么时候从一个程序转换到另一个程序呢？的翻译：The operating system how to know when to transition from one program to another program? 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

How to know when the operating system from one program to another program?

The operating system how to know when to transition from one program to another program?

How did the operating system know when transforms from a procedure to another procedure?

How do you know what operating system when converting from one program to another program?

The operating system how to know when to transition from one program to another program?