They run directly on the hardware with guest operating systems running on top of them.
它们直接运行在硬件上，虚拟的操作系统又运行在它们之上。
In the context of this article, an operating system running directly on hardware is a physical (or non-virtualized) system.
在本文的背景下，在硬件上直接运行的操作系统是一个物理系统(或者“非虚拟化系统”)。
A VMWare ESX system (Figure 23) is a type of hypervisor that runs directly on hardware, in place of an operating system.
VMWare ESX系统(图23)是在硬件上直接运行的虚拟监管系统的一种类型，而不是在操作系统上运行。
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