虚部件设计有三方面的需求：第一、采用系统级设计语言进行功能描述。
There are three demands in designing a virtual component, include: first, we should describe the virtual component with system level design language.
MPEG4编解码芯片包含了复杂的算法，利用系统设计语言建立事务级的参考模型已经非常有必要。
The MPEG4 encode and decode module include complex algorithm , so it is very necessary to build a transaction level reference module .
C语言被设计成一个比它的前辈更精巧、更简单的版本，它适于编写系统级的程序，比如操作系统。
It was designed to be a smaller and simpler version of its predecessors, suitable for writing system-level programs, like operating systems.
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