当这种映射发生时，硬件将负责访问(和保护)，客户操作系统在使用该设备时，就仿佛它不是一个虚拟系统一样。
When this mapping occurs, the hardware takes care of access (and protection), and the guest operating system can use the device as if it were a non-virtualized system.
当设备被模拟(比如虚拟网络适配器)时，模拟提供一个抽象层以抽象物理硬件。
When devices are emulated, such as virtual network adapters, the emulation provides a layer to abstract away the physical hardware.
当从磁盘上加载一个脚本或等待硬件设备启动的同时，可以运行另一个脚本来启动另外一个服务。
While one script is being loaded from disk or waiting for a hardware device to start, another script can be running to start another service.
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