The envelope descriptor describes all metadata for the virtual machine (s) (including virtual hardware) that make up this OVF package.
信封描述符描述构成此ovf包的所有虚拟机元数据(包括虚拟硬件)。
This is called a virtual machine because it's been designed for implementation in software, rather than hardware.
它被称为虚拟机，因为它被设计成用软件来实现，而不是用硬件来实现。
This model USES a virtual machine that mediates between the guest operating systems and the native hardware (see Figure 2).
这种模型使用一个虚拟机，它在客户操作系统和原始硬件之间进行协调(参见图2)。
Many times, this complex software runs in its own virtual machine (such as a JVM), which itself may be running on virtualized hardware resources.
很多时候，这种复杂软件可在它自己的虚拟机(比如jvm)中运行，而虚拟机本身可能在虚拟硬件资源上运行。
Something to note is that a virtual machine will not be as fast as a native application (native = running on non-virtualized hardware).
需要注意的是虚拟机运行并不会像本地主机（就是运行在非虚拟的硬件上的系统）上的程序一样快。
You can use add-ons to augment the hardware and OS configuration of a virtual machine.
附件可用于扩大虚拟机的硬件和OS配置。
The guest operating system USES APIs, provided by virtual machine monitor (VMM), to communicate with the hypervisor to directly access certain resources on the underlying hardware.
访客操作系统使用虚拟机监视程序(VMM)提供的API与hypervisor通信，从而直接访问底层硬件上的某些资源。
The Windows Server 2008 was designed enlightened so it would know when it is running as a virtual machine and it would know when it is running on physical hardware.
WindowsServer 2008就被设计成这样，因此它清楚何时作为虚拟机运行，何时在物理硬件上运行。
Each operating system USES its own virtual machine that cooperates with the hypervisor to arbitrate access to the physical hardware (see Figure 2).
每个操作系统都使用自己的虚拟机，虚拟机与管理器协作，从而决定对物理硬件的访问(见图2)。
P-code is a machine language that is executed in a virtual machine rather than in actual hardware.
P - code是一种机器语言，运行于虚拟机而不是实际硬件。
Performance (high performance) : in the virtual environment, most of the instructions in the virtual machine manager without intervention, the implementation of physical hardware directly.
(高性能)：在虚拟环境中应用程序绝大多数指令在虚拟机管理器不受干预的情况下，直接在物理硬件上执行。
The technique of virtual machine that utilizes hardware and the system environment with software has been used widely.
虚拟机技术利用软件模拟硬件及系统环境，在很多领域被广泛应用。
The technology of virtual machine is widely applied in many fields, such as code transplanting, cross-platform computing, and hardware simulation.
目前虚拟机技术广泛应用于代码移植、跨平台计算和模拟硬件机器等领域。
The system kernel has two main functions: the one is to manage the hardware resource, and the other is to hide the difference of different hardware and provide virtual machine for applications.
系统内核主要具有两个功能：其一是管理硬件资源，其二是屏蔽具体硬件差异并为应用程序提供虚拟机。
For example, virtual machines that are running out of resources on one physical machine can be automatically relocated to new hardware with minimal disruption and end user transparency.
比如，在一台物理机器上运行的虚拟机，假如出现了资源溢出的情况，就会被重新定位到另一台拥有空闲资源的，且对最终用户透明的机器上去。
For example, virtual machines that are running out of resources on one physical machine can be automatically relocated to new hardware with minimal disruption and end user transparency.
比如，在一台物理机器上运行的虚拟机，假如出现了资源溢出的情况，就会被重新定位到另一台拥有空闲资源的，且对最终用户透明的机器上去。
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