Another way to define it is, virtualization allows the user to run multiple applications in an existing operating system.
另一种定义方法是，虚拟化让用户可以在一个现有的操作系统中运行多个应用程序。
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.
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。
Operating system-level virtualization is a server virtualization method where the kernel of an operating system allows for multiple isolated user-space instances.
操作系统级的虚拟化是一种服务器虚拟化方法，在这种方法中，操作系统的内核支持多个相互隔离的用户空间实例。
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