整个解释器的核心是一个虚拟的寄存器机器，及其支持的一套基本指令集。
The core of the scheme interpreter is the Virtual Register Machine with a set of supported basic instructions.
嵌入式系统仿真的核心工作就是指令集仿真，但纯手工开发一个指令集仿真器不但是一项繁重的工作，而且极易出错。
The core work of embedded system simulation is instruction-set simulation, the development of Instruction Set Simulator purely by hand is an onerous task, and easily goes wrong.
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