从某种意义上说，没有操作系统的计算机是没有用的。

In a certain sense, not the computer operating system is of no use.

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没有操作系统，用户不能在他们的计算机上运行一个应用程序，除非是自启动的应用程序。

Without an operating system, a user cannot run an application program on their computer, unless the application program is self booting.

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应用软件坐在系统软件的上面，这是因为如果没有操作系统和系统公用程序应用软件将不能运行。

Application software sits on top of system software because it is unable to run without the operating system and system utilities.

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