我们就需要工具使结果精确（在返回的前几十个结果中，操作系统的效率（operating system robustness），这些任务变得越来越艰巨，同时不断有毫无经验的新用户来体验Web这门艺术。
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在hypervisor和访客操作系统之间有通信机制，用以提高相互协作的性能和效率。
There is a communication mechanism between hypervisor and guest operating systems to improve performance and better efficiency with mutual cooperation.
尽管这样做提供很大的灵活性(即运行未更改的操作系统)，但它的效率比较低(参见图1左边)。
Although doing so provides the greatest flexibility (namely, running an unmodified operating system), it does introduce inefficiency (see the left side of Figure 1).
首先，写一个全球个人电脑都容易收到感染的病毒会比去写一个很少人使用的操作系统病毒更为有效率。
For one, writing nastiness that the vast majority of the world's personal computers are susceptible to is a more efficient use of resources than writing the same evil for a sliver of the population.
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