在虚拟实现平台运行时，可以通过选择不同的电路图文件做不同的实验。
As the platform is activated, it can implement different experiment by choosing different circuit diagram file.
根据这些文件，Eclipse平台运行时就在启动时在内存中构建一个全局注册表，称为插件注册表，根据这个注册表，给定的插件就可以在运行时确定其它哪些插件希望扩展它。
From these files, it builds at startup a global in-memory registry, called the plug-in registry, from which a given plug-in can determine at run time what other plug-ins wish to extend it.
需要运行时平台进行实现。
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