QEMU provides two modes of emulation.
QEMU提供两种模拟模式。
Emulation of external services (mocks).
模拟外部服务(mock)。
Each emulation approach has its own setup requirements.
每个模拟方式都有其安装要求。
Figure 16 shows a programmatic emulation after it has run.
图16显示了运行后的编程序模拟。
Manual emulators will pause for you to enter emulation data.
在输入模拟数据时，手动模拟器将暂停。
System calls are the easiest and the hardest part of emulation.
系统调用是模拟中最简单也是最困难的部分。
We'll talk more about creating emulators in the Emulation section.
在模拟部分中，我们将介绍关于创建模拟器的详细内容。
This is where binary emulation becomes important for NetBSD users.
在这种情况下，二进制模拟对于NetBSD用户来说非常重要。
When testing modules (as opposed to components), emulation is disabled.
测试模块(而不是组件)时，将禁用模拟。
Full hardware emulators are in some ways the simplest way to do emulation.
就某些方面而言，完全硬件模拟器是进行模拟的最简单方式。
This type of emulation is created by default any time an emulator is created.
缺省情况下，在创建模拟器的任何时候都可以创建此类型的模拟。
The second architecture is called user space device emulation (see Figure 2).
第二个架构称为用户空间设备模拟(见图2)。
In the world of emulation, software emulators are where life gets interesting.
在模拟世界中，软件模拟器是最基本的。
By the 1990's, however, emulation of other banking models was back in fashion.
然而，到了20世纪90年代，模仿其他银行模式的做法重又流行。
The VMM also implements device emulation for devices made available to each guest.
VMM还为每个来宾可用的设备实现了设备模拟。
Full hardware emulation is especially common for accessing older-machine programs.
完全硬件模拟常用于使用较老机器的程序。
The emulator is running a true virtual machine, including full processor emulation.
模拟器运行的是真正的虚拟机，包括完整的处理器虚拟。
The hypervisor implements the back-end drivers for the particular device emulation.
Hypervisor为特定的设备模拟实现后端驱动程序。
To see what values the emulation received and then returned, click the Emulate event.
要查看模拟接收和返回了哪些值，请单击模拟事件。
In general, application emulation targets platforms that possess the larger market shares.
通常，应用程序模拟以占据较大市场份额的平台为目标。
Before you can use QEMU in system emulation mode, you must install a guest operating system.
在使用QEMU系统模拟模式之前，必须安装一个客户操作系统。
The net gain is twofold. First, no emulation reduces overhead for virtualization processing.
这带来了两方面的好处，首先，没有模拟减少了虚拟处理的开销。
The second component provides for PC platform emulation, which is provided by a modified version of QEMU.
第二个组件用于PC平台模拟，它是由修改版QEMU提供的。
This spending might be motivated by escapism-the poor have a lot to escape-or perhaps by social emulation.
这项花费可能是受逃避现实心理的驱使——穷人要逃避很多东西——或者可能是社会效仿心理在作怪。
Although the emulation is clean at this abstraction, it's also the most inefficient and highly complicated.
尽管在该抽象中模拟很干净，但它同时也是最低效、最复杂的。
Figure 14 shows the programmatic emulation editor and Figure 15 shows the implementation for the emulation.
图14显示了编程序模拟编辑器，图15显示了模拟的实现。
Don't confuse binary emulation with the CPU-hungry process of hardware emulation, which is not at play here.
不要将二进制模拟和硬件模拟的较少使用CPU的进程弄混，这里没有使用到后者。
Binary emulation is often suitable for running processor-intensive applications in a production environment.
二进制模拟通常适合于在产品环境中运行处理器密集型应用程序。
Before we jump into passthrough, let's explore how device emulation works today in two hypervisor architectures.
在探索透传技术之前，让我们先讨论一下如今设备模拟在两个管理程序架构中是如何工作的。
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