用于修饰或说明不作为基本操作系统的组成部分所提供的软件。
Pertaining to software that is not supplied as part of the basic operating system.
当被看作是超级系统的基本操作系统或者混合操作系统的组成部分时，Linux现在占有469个位置，即占Top500超级计算机的93.8％。
When considered as the primary OS or part of a mixed-OS supersystem, Linux is now present in 469 of the supercomputer sites, 93.8% of the Top500 list.
计时器是所有操作系统的一个必要组成部分，您将发现多个计时器机制。
Timers are an integral part of any operating system, and you'll find multiple timer mechanisms.
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