操作系统软件应该灵活而有效。

Operating system software should be flexible and efficient.

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操作系统在计算机中是最重要的系统软件。

In the computer operating system is the most important system software.

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操作系统是计算机系统中最重要的一类系统软件。

Operating system is the most important type of system software in a computer system.

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操作系统是计算机系统中最重要的一类系统软件。

Operating system is the most important type of system software in a computer system.

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